In this article, we will look at situations in which the computer may not turn on or boot. Also, we will give some tips for solving such problems.
The computer does not turn on
(When you press the power button on the system unit, nothing happens: the lights do not light up and the noise of the fans is not heard)
When the computer does not show any signs of operation, the problem is in the hardware.
Solutions.
Step 1. First, check and rule out “inattentive” reasons:
- have you forgotten to turn on the button on the extension filter;
- is the power supply toggle switch off (located behind the system unit near the place where the 220V cable is connected;
Step 3. If the problem persists, you should stop independent searches and contact the service center!
The computer turns on but does not boot
(When you press the power button, you can hear the noise of the cooling systems, but the download does not reach the desktop)
This symptom can be due to both hardware problems and software.
The symptoms of this problem are divided into 3 subspecies:
I. There is no image on the screen - neither the BIOS screen, nor the operating system boot screen
Step 3. If the problem persists, try replacing the BIOS battery on the motherboard - type CR2032
Step 4. If the problem persists, contact the service center.
II. There is a BIOS image on the screen, Windows is not booting up.
Step 1. Turn off computer. Open the system unit and check if the power cable and SATA cable are connected to the hard drive.
Disconnect and reconnect them.
Step 2. Boot from the Windows distribution and perform a system restore.
How to create a bootable USB flash drive:
How to boot from a USB flash drive containing a Windows distribution kit:
How to enter Windows recovery mode: an article will be added later
Step 3. Reinstall the system
Step 4. If the problem persists or recurs intermittently even after reinstalling the system, contact the service center.
- Do not place the system unit on the floor or other particularly dusty surfaces. Try to place the unit on a stand or in a special niche on your computer desk.
- Clean the room often, even when it is damp. The less dust around the computer, the less often you have to clean the computer from dust.
- Clean the system unit at least once every six months. We advise you to entrust the cleaning of the system unit to specialists. However, if you consider yourself an advanced user, we recommend reading the article on cleaning your computer.
- At least once every 3 years, replace the thermal paste on the central processor, video card and chipsets that have heatsinks.
- We strongly recommend replacing the BIOS battery (type CR2032) every 5 years, even if the computer is operating normally. It is better to do this in advance than it will be an unpleasant surprise at the wrong moment.
Sooner or later, each user may have problems starting the computer. Problems with booting a computer are not always caused by a breakdown, very often we are the cause of this, and this can be eliminated very quickly and easily. In this article, we will consider the most common reasons why the computer does not start, so that you can quickly solve the problem, and you do not have to call a specialist.
This can be either the simplest reason for not turning on the computer, or the most difficult. Let's start with a simple one. If your computer does not turn on, then the most common reason is the lack of power supply to it. This happens as a result of several factors:
- Power supply off
- The power cable is poorly inserted into the system unit
- Computer power cable plug is pulled out or not inserted properly
- Regulator or UPS not working
- Surge protector or outlet does not work
Another fairly common reason why the computer does not turn on is the incorrect connection of its components in the system unit, this quite often happens when users clean the computer on their own, and at the same time disconnect the wires or accidentally touch them.
The next reason is a breakdown of the power supply, this is a fairly frequent breakdown in computers, since on average, power supplies work for 3 years, after which they often fail. If the power supply is also in working order, then there are 2 variants of breakdown: either the motherboard has failed, or the contacts have oxidized.
The computer does not turn on, but the fans are running
Computer starts up but nothing happens? Check all contacts and connections of components in the system unit. Most often this happens after self-cleaning the inside of the system unit and accessories. Also, in some cases, resetting the BIOS helps, for this it is necessary to close the corresponding terminals on the motherboard and restart the computer, before starting the settings of the reset BIOS.
The computer does not turn on and beeps
If the computer turns on and beeps, it means that one of the devices is missing or not connected correctly. By the nature of the sounds emitted, or rather by the number of long and short squeaks, you can determine what exactly the problem is. It may be necessary to pull out and reinsert this component, clean the contacts or replace it due to failure.
The computer turns on but does not boot
If the computer turns on, but does not start, then this happens for three reasons, let's consider them:
- The computer does not see the hard drive on which the operating system is installed
- The system loader does not specify or is specified incorrectly the partition from which it needs to boot
- Operating system problems
The computer turns on, but there is no picture
If the computer turns on, but it has a black screen, then, probably, the problem lies in the incorrect connection of the monitor. To do this, check the correct connection of the cable going to the monitor, both from the side of the system unit and from the side of the monitor itself. Then check the settings in the monitor itself so that the correct connection type is set there: VGA, DVI or HDMI. Also check the power cable to the monitor to make sure it is properly connected.
The next reason why there may be no image on the monitor is the failure of the video driver. Try booting your computer in safe mode and reinstalling the video driver. If this does not help, try connecting the monitor to the integrated video card by pulling out the discrete one. If the image appears, then there is a problem with the video card (try to clean the contacts and insert the card into the connector well), if there is no image, then it is possible that the problem is in the monitor.
The computer turns on and off immediately
This situation occurs for two reasons: the cooling cooler has failed or the power button is jammed. Therefore, check the cooler's performance, if everything is in order with it, then disconnect the start button from the motherboard and start the computer by closing the start terminals (be careful and do not do this if you have no experience!), If the computer starts and does not turn off, repair the button ...
Probably, there is no need to explain that situations when the computer does not boot are quite common. There may be a myriad of reasons that led to this. Now we will try to figure out why such situations arise and how to deal with them. Consider desktop computers, not laptops, although in some cases the methods for solving the problem may be very similar.
Causes of Boot Problems
First of all, in the question of why the computer does not boot, you need to understand that among the main reasons there are two main ones: physical damage to the components of the computer system and software failure (in this case, Windows).
Both of these can cause serious problems. Let's consider the most basic causes of failures and figure out how to eliminate the consequences.
Consequences of physical impact
As for the damage to the physical components, first you should pay attention to the initial stage of the PC boot. Probably everyone knows that when turned on, the system unit emits a characteristic sound (one-time squeak). This indicates that all the "iron" components are in order. True, this is not always the case. The fact is that a hard drive failure is detected only after the start (the system does not see it).
Sometimes the system speaker can emit short and long beeps. Now this is worse. This can only mean one thing - any component does not work, is out of order, or is simply incorrectly connected to the motherboard. Signals may differ for different BIOS versions. But all of them may indicate malfunctions in the operation of the RAM, video card, central processor, etc. In some cases, the signal may be absent altogether.
In this case, it is recommended to remove the system unit panel and check if all components are connected to the "motherboard". It may well be that the device does not work, not because of failure, but because the corresponding loop is damaged. Naturally, it is not possible to determine such a malfunction yourself, so you will have to contact specialists.
Often there are cases when the computer does not boot even when turned on. There may be enough reasons for this too. It is very likely that there is simply no power supply. It is worth checking the outlet or "uninterruptible power supply". Sometimes, when a large number of electrical appliances are plugged into an extension cord, protection and much more can be triggered. You can check the battery that is installed on the motherboard. It may very well be that after replacing it, turning on and loading the computer will go on as usual. Often no one pays attention to this, nevertheless the fact remains.
In general, you immediately need to check all the cables, sockets, extension cords, etc. Maybe this is really the reason. That is why it turns out that nothing starts, nothing is loaded, the computer is black and does not show any signs of life.
Crash system
Of course, you can replace the hardware, but the situation with the operating system itself is much worse, because no one clearly wants to reinstall the system, format the hard disk or partitions, which will entail data loss.
The reasons for the "rally" Windows can be called just a lot: a sudden power outage, improper shutdown or shutdown, software failure, presence of viruses, damage to the hard drive, etc. The list can be endless.
As for the physical damage to the hard drive, the severity of the problem can be found out only after full testing of the surface and contacts. If it burns out, you know, you will have to fork out for a new one, there is nothing you can do about it. If the damage is minor, you can try to repair the damaged sectors. This will be discussed a little later.
Basic methods of correcting the situation
As it is already clear, in terms of hardware failure, when the computer does not boot, the black screen hangs constantly, the system unit does not make a sound, the solution will be to fully test all the components. It is very possible that reconnecting or replacing some of them will clarify the solution to the problem.
It is worth noting that in some cases, when the system does not detect the hard drive, the most commonplace situation may appear. In the BIOS, the boot priority can be set to the first, say, CD / DVD / ROM, the second device is a USB drive, etc. It is clear that when this type of media is inserted, the system will display a message stating that this is not a system disk.
It also happens that the computer does not boot from the disk with the Windows installation distribution kit. Here you have to check the disk itself. It may very well be that there are some scratches or other damage on it. By the way, maybe the drive itself is damaged and simply does not work.
Now a few words about how to fix the situation when the computer does not boot, Windows 7 does not start, and in general it seems that nothing can be done.
Let's say right away: do not despair and panic. Bill Gates is not at all stupid. While creating his system, he left loopholes for restoring the operability of "operating systems", and today there are many methods that allow you to quickly and effectively apply measures that can, so to speak, breathe new life into the system. Below we will describe the most common problems and methods of their elimination from the point of view of the Windows software shell.
Last Known Good Configuration Boot and System Restore
As a rule, even after very serious errors in the work of Windows 7, as they say, it just doesn't give up. On reboot (if everything is ok with the boot records), testing occurs, and then in most cases a message is displayed about possible boot options, including loading the last known good configuration.
This happens because the system, as it were, remembers its last working state and proposes to go to it, bypassing all the changes made before. It helps in 90% of cases. However, it also happens that the computer does not boot even with Windows self-healing, and the user eventually receives a message that such a configuration could not be loaded.
The same goes for using System Restore, which may be offered at Windows startup. Sometimes it helps, sometimes it doesn't. Basically, both services are very similar. In this state of affairs, more effective measures will have to be taken.
Safe mode
Many users, when faced with a problem, for example, when the computer does not boot after updating Windows 7, clearly underestimate the benefits of Safe Mode, and in fact it allows you to access a fully functional system and fix many software errors.
To load safe mode after starting the system, press and hold the F8 key. When the system boots up, we can tackle our problem. In this case, you can check all the "hardware" components for operability and the presence of appropriate drivers, run a disk check for errors, and finally start restoring the system.
System Restore
First of all, using the control panel, you need to go to the "Backup and Restore" section. It can also be accessed from the main Start menu under All Programs / Maintenance. Here you need to select a checkpoint (the last one created or one of those that are present in the list) and start the process itself. This, of course, can take a lot of time, but if you do not want to reinstall, you will have to endure.
Now let's say that after the updates, the computer does not boot. In the same control panel, if you go to "Windows Update", you can view the update log, in which, in fact, you will need to delete everything that was installed before the "crash" of the system, no matter whether these updates were installed automatically or in manual mode.
In many cases, this approach allows you to reanimate Windows without resorting to more serious methods that not every user will be able to handle.
Using the Recovery Console
If the above method does not work, you will have to use other methods. One of the most effective and radical methods in the case when the computer does not boot is the use of the recovery console, which is available either on the installation or on the rescue disk of Windows 7.
To use such disks, naturally, you should make the appropriate boot priority settings in the BIOS, specifying the CD / DVD-ROM first in the list.
The boot menu will show the "Welcome To Setup" screen, after which you will need to press the "R" key to go directly to the console (command line). It is worth considering that if more than one "operating system" is installed on the computer, folders with files will be shown first, and then a request will follow which system the user wants to work with. Now you just need to enter the number corresponding to the number of the selected system. This may be followed by a request to enter the administrator password, provided that there is one. Now about the teams. What and how to enter and what to use, we will now figure it out.
Restoring the boot file Boot.ini
As a rule, one of the reasons for the "crash" of the system is damage to the boot file Boot.ini, which is responsible for booting the system. To restore it, almost all systems use a tool called Bootcfg. Bootcfg / Rebuild is entered on the command line (not counting other toolkits for scanning its entries, redirecting actions, adding IDs, etc.). It seems that apart from the basic recovery command, the average user does not need anything else.
Recovering the Master Boot Record
The master boot record contains tables of all logical partitions on the hard drive. The so-called primary loader places active and boot sectors in the tables, after which, in fact, the system starts. If the boot record is damaged, the active sector simply cannot start the system.
To restore, in this case, the Fixmbr command is used, after which the distinguished name of the disk or partition is entered. For drive C, the command will be Fixmbr \ Device \ HardDisc0.
Restoring the boot sector of the hard drive
The boot sector is a small partition on the hard drive for storing data in FAT32 or NTFS file systems for boot. If it is damaged, the Fixboot \ c: recovery command is used (provided that the operating system was installed on the C drive).
Quick system reinstallation
Again, consider the situation when, after updating Windows 7, the computer does not boot, and the system simply does not want to start. As a last resort, you can apply the so-called quick reinstallation of the system in the same folder where the previous OS was installed. In some cases, this can fix errors.
After starting the system from the disk, the license agreement window will appear. You can agree to the terms by pressing the F8 key, after which you will be prompted to select an installation method. Key "R" - restore the existing version, Esc - cancel the restore and go to the new installation. In most cases, the recovery goes smoothly.
Virus check
Now a few words about another unpleasant situation when the system does not start and the computer does not boot. A black screen can be the result of spontaneous viruses that either prevent the system from booting or modify the boot records.
In this case, it is recommended to use utilities such as Kaspersky Rescue Disc or Dr. Web Rescue Disc. As it is already clear, such programs start directly from the optical disk, but, what is most interesting, they are loaded even before Windows starts. They have a graphical interface, so working with them is easy. It should be noted that in 99.99% of cases such applications remove even those viruses that cannot be removed using standard scanners installed in the system. After all, they can "hang" even in the RAM. At the end of the check, the computer terminal is restarted, and, hurray, the system works again as if nothing had happened.
Conclusion
So we have considered the question of what to do if the computer does not boot. It seems that some solutions to this problem will be useful to many users. Of course, right away like this, on the fly, it is quite difficult to say why the computer or "operating system" does not boot. But if you conduct a comprehensive test and find out the cause of the problems, then you can choose the most appropriate method to correct the situation.
An unpleasant situation when after pressing the Power button the computer does not turn on can happen to any user. The reasons for this behavior of the system can be different. But do not panic, many of them can be eliminated on your own or by contacting specialists.
Reasons and solutions
If, when you turn on the machine, it does not show signs of life, does not start or does not load the operating system, in general, the reasons for this can be very different and we will analyze them below.
The most common problems are:
- lack of connection to the source of electricity;
- malfunction of the power supply;
- CMOS battery problems;
- problems with components;
- broken power button;
- malfunction of the motherboard.
Some of these problems are easy to diagnose and fix at home, while others will have to be handled. In any case, trying to fix the problem yourself will be useful.
Problems with 220V
Often, users, due to their carelessness, face elementary difficulties, but do not panic ahead of time. First you need to see what happened. If the fans are not spinning, the indicators do not light up, then it is necessary to check the presence of power.
First of all, in the event of a malfunction of any equipment, check whether its connection to the mains is correct
You can check that the PC is receiving electricity by following a few simple steps:
- make sure that there is voltage in the outlet;
- check the connection of the surge protector to the outlet and its operation, for example, by turning on another device;
- make sure that the electrical wire is correctly connected to the system unit and the outlet.
If it was not possible to fix the problem by simply checking the PC connection, then we look for the malfunction further.
Power supply defective
Problems with turning on the PC quite often occur due to a faulty power supply. Such a malfunction occurs due to voltage surges, which are not uncommon in our networks.
Consider the main signs indicating a malfunction of the power supply:
- when you press the power button, the equipment does not react at all;
- indicators light up but nothing starts.
In any case, it is possible to determine whether the power supply unit is to blame for the situation only by installing another one that is known to be in good working order. In many cases, if this component fails, you will also have to replace the motherboard or send it for expensive repairs.
Video: If the computer does not turn on, what should I do?
Battery does not work
There is a small CR-2032 battery on the motherboard inside the system unit. It is responsible for storing the settings of the basic PC I / O system. The battery life is long enough.
But in some cases, the CR-2032 battery fails after a couple of years, and various snags appear with the clock and switching on. In this case, you just need to replace it.
Consider how a battery drain usually manifests itself.CMOS:
- the computer does not turn on at all;
- start occurs after several clicks on the power button;
- clock failures;
- arbitrary switching on of the PC when voltage is applied;
- reboots without prompting the user.
In fact, the appearance may vary slightly depending on the system configuration and other external factors. You can buy the battery you need to replace it at computer, hardware and other stores.
Dust in the system unit
A fairly common cause of problems with starting a computer is its dustiness. Failure in this case can manifest itself in different ways: from stopping the system, to an arbitrary shutdown or inability to start the machine.
The procedure for cleaning the system unit:
- disconnect by pulling out all cords from the outlet;
- open the cover;
- remove dust, for example with a brush;
- clean contacts of RAM, video card and other components;
- check the fans for jamming;
- if necessary, perform preventive maintenance by replacing the thermal paste.
Component problems
Failure of individual components of the PC can also lead to the inability to start it. In this case, it is quite difficult to diagnose a malfunction at home on your own. In some cases, the OS startup signals can help in identifying the problem.
In this case, you need to know the manufacturer of the BIOS. In addition, a description of the signals given when turning on can be found in the instructions for the motherboard. Most often, a squeak can indicate a problem with the RAM or video card.
You can eliminate the malfunction by replacing the components with serviceable ones, but before that it is recommended to try to clean the contacts with a regular school eraser. In some cases, this method is very helpful.
The reason why it is not possible to start the PC from the button may lie in the switch itself. Simply put, it may not fully close the contacts. You can check the problem yourself by closing the corresponding pair of contacts on the motherboard using a screwdriver.
Attention! It is recommended to close contacts on their own only to those who are confident in their actions and have the necessary knowledge. The rest are better off seeking help from our specialists.
Motherboard
It is possible to determine the malfunction of the motherboard or system board on your own with high accuracy only by replacing all other components with serviceable ones. In rare cases, the signals supplied by the BIOS will help in diagnostics.
Most often, when such a problem occurs, the fans turn on and work, but there is no image output and another reaction of the PC to user actions. In most cases, it makes no sense to repair the motherboard, since the cost of work can exceed the price of a new part in the store.
Note. Often, problems with the mother are mistakenly described as a malfunction, I turn on the computer, but the monitor does not turn on. There is confusion between monitor problems and no video signal. It is easy to check the operation of the monitor by disconnecting the signal cable from the system unit and looking for the manufacturer's splash screen.
The computer does not turn on
Your personal computer can stop turning on for a huge number of reasons. But among them, the most common ones can be distinguished. Some of them can be eliminated by the PC owner himself without contacting a service center, but first of all, it is necessary to establish the cause of the malfunction.
Consider the most common malfunctions due to which the equipment may not turn on:
- defect in the video card;
- processor problems;
- subsequent cleaning problems;
- crashes due to hibernation;
- incorrect operation due to replacement of parts.
Video card defect
Video card problems are easy to diagnose. First of all, including the computer, and the monitor does not turn on, the fans will mostly spin.
When installing a working video card, the image usually appears. Owners of motherboards with integrated video can also use it to test the functionality of the video adapter.
Most video cards fail due to poor cooling, for example, when the system unit is very dusty or a broken cooler. Therefore, during prevention, it is necessary to pay special attention to removing dust and checking the fan on the video card.
Due to the replacement of the processor
After replacing the processor, users often encounter the inability to turn on their home computer. This problem is usually easy to fix.
- check the compatibility of the motherboard and the new processor;
- reset BIOS settings;
- clean up contacts;
- make sure all accessories are installed correctly.
Advice . In addition, the signals emitted by the system speaker can help with diagnostics.
Power surges can damage many components in your PC. As a preventive measure, it is recommended to connect the computer to the power supply using high-quality stabilizers.
The most common components that fail during power surges are:
- power unit;
- motherboard;
- video card.
It is worth noting that several components can be damaged at once, and not necessarily from the list above.
The consequences of cleaning
Many users, deciding to clean the dust from the system for the first time, are faced with the inability to start the PC after reassembling. In this case, there may be quite simple reasons or components may fail.
Measures to be taken if the PC does not start after cleaning:
- check the cable connections;
- make sure that the power supply connectors are properly and tightly connected to the motherboard;
- check the installation of RAM and video card;
- if the cooling system was removed, then you need to make sure that it was installed correctly and there is a sufficient amount of thermal paste;
- make sure that the rest of the boards and devices (hard disk, drive, etc.) are connected correctly;
- reset BIOS settings using a jumper or by removing the battery for a few minutes.
Hibernation and its consequences
Hibernation mode is designed primarily to reduce the power consumption of notebook computers and maximize battery life. When you turn off the PC in this way, all data is saved on the hard disk. Some systems cannot turn on after entering this mode.
You can start the computer by disconnecting the power supply from the mains for a few minutes and then turning it on again. In this case, the OS may stop starting. We'll have to use System Restore.
Some PC owners are forced to replace the motherboard due to the fact that the old one is out of order. In this case, it is important to make sure that the new board is compatible with the rest of the components, as well as perform the installation correctly. Even so, problems can occur.
Consider the basic steps if the computer does not start due to the replacement of the motherboard:
- check the connection of the power supply and the installation of additional boards;
- temporarily disconnect the hard drive and other external devices, without which start is possible;
- make sure that the RAM is installed correctly, clean the contacts on the modules;
- try to start the board without installed RAM and video card and check for signals through the speaker;
- successively replace the power supply, RAM, video card, processor with a known working one.
Updates
During the installation of some updates, the operating system may be disrupted and as a result, the PC stops starting. For a solution, you will have to use System Restore.
Launch System Restore inWindows 7:
The system will then try to fix startup problems on its own. If the problem persists, you can try reinstalling Windows.
When replacing RAM
Problems after replacing RAM are rare. First, make sure to select compatible modules.
4 points to complete if the PC stops starting due to the replacement of RAM:
- check if the module is installed correctly;
- try to start the system using only one module;
- clean contacts;
- perform a test start of the system with a known good module.
The computer turns on, but there are problems
In some cases, the computer turns on, the fans start, but the operating system does not load or there is no image on the screen. There are many reasons for this behavior of computers.
Is not downloading
If the machine turns on, but Windows does not load, then you need to look for the problem in it. This behavior occurs when a failed update, incorrect installation of programs, or simply due to a malfunction.
You can try to fix the problem with loading the operating system in the following ways:
- start the computer in safe mode and try to roll back to one of the previous restore points;
- use OS recovery tools;
- scan for viruses using special bootable disks;
- reinstall Windows.
It should be noted that in some cases, the inability to start the OS may be associated with a hardware malfunction. Then you can try using specialized utilities for testing HDD and RAM, or contact the service center.
No picture
In some cases, the equipment is launched, but there is no image. At the same time, all the fans are turned on, the hard drive can be heard, and sometimes Windows even starts, which is audible by the characteristic sound. This problem is mostly hardware-based.
What to do if the computer turns on, but there is no image:
- check the connecting cords;
- make sure the monitor is working by disconnecting it from the system unit;
- clean the contacts of the video card and check the operation of the cooler;
- try using a different external or integrated video adapter.
There are a lot of problems due to which the machine does not turn on or does not start the operating system. You can try to fix many of them yourself using the tips from this article. If all else fails, or the diagnostic process seems difficult for you, then you will have to seek help from our specialists by leaving a request. Do not waste time if you do not have experience, do not disassemble the computer, you can only aggravate the situation, and our specialists will help you quickly.
Good day to all. Today the topic of our computer conversation is devoted to the case when you turn on your computer, but it does not turn on. The moment, you see, is not a pleasant one. Moreover, yesterday you worked quietly, turned it off, but today nothing turns on for you.
There can be many reasons for this. Some of them can be eliminated on our own, others only with the help of a specialist. But, before we run into the workshop, let's take a look at these reasons. Maybe you can fix something yourself.
Because of what your computer may not turn on. First, let's define how it doesn't turn on: it doesn't turn on at all, it turns on, but it doesn't load, or it turns on, but the monitor is clean.
These cases can be categorized into two problems: hardware problems and system problems. If the coolers are working, the computer beeps, the monitor starts running the BIOS and that's it, then the problem is in the system itself. It is a little easier here, we reinstall and work further. Otherwise, you have hardware malfunctions.
Here are the top most common reasons for this:
- Power problem
- Burnt out power supply
- Defective monitor
- The battery on the motherboard has run out
- System block contamination
- Problems with connecting components or loops
- Power button malfunction
- Faulty motherboard
If your computer does not turn on, the first step is to check if voltage is supplied to the computer. Here, first of all, we check the power supply itself. It has an on / off button. Maybe she was turned off.
In addition, the power supply can be checked again by replacing it with a working one. We disconnect all the cables from the motherboard and in their place we connect another power supply unit, a worker. If everything worked with him, then the problem is in your PSU. If you do not have another power supply, then using any conductive material: paper clip, etc. it will be necessary to close the green and black contacts on the unit being tested. If the fan is running, then the unit is in order.
Checking network cables
Next, we check the network cables. Perhaps some of them are poorly inserted, or they just need to be replaced. If your computer is running through a UPS, then you need to check that too. If the computer is connected through a surge protector, then the problem may be in it. We also check its performance.
Checking the power buttons
We check the power buttons on the processor. It happens that they sink. If everything is fine, then we are looking for power connectors on the motherboard (the instructions for it have all the descriptions with pictures). We take out the plug and close the contacts with tweezers.
The computer will either turn on, then the point is in the button, or not.
Reset BIOS settings
If your computer does not turn on, then we try to reset the BIOS settings. This is done using a special jumper (jumper) located next to the battery. We take out the battery for a couple of minutes. After that, the settings will be reset to the factory settings. You can even replace the battery itself.
Also, do not forget to clean the board and all its components from dust. After that, turn on the computer again. If it doesn't help, proceed to checking all the components
Checking computer components
First, we remove everything from the motherboard that is installed on it: the processor, RAM modules, hard drive. We leave only the power supply, the motherboard itself, and the wires of the power / reset button connected to it. After that, turn on the computer. What should it be? If the PSU fan does not spin, or if it starts but shuts down after a few seconds, then the motherboard is faulty. We replace it. If the fan rotates normally, then it is not a matter of the "motherboard".
The next steps are as follows: we insert each component one by one and turn on the computer. If after the inserted component the computer works, then this element is working properly. If it does not turn on, then it will be necessary to replace the defective part. Memory modules must be tested across all slots for which they are intended. It may turn out that the problem is precisely in the malfunction of a slot.
The last one to check is the hard drive. If the computer turns on, but does not start, then we look to see if the processor sees it. If he sees - the problem is in the operating system, if not - in the hard drive itself. It is necessary to diagnose it. In addition, when you turn on the computer, carefully listen to whether the hard drive makes and what sounds. If it hums normally, then the disc is intact, if it is silent or sounds somehow different, then most likely it is broken.
So, let's summarize what you need to do to check your computer:
- find out that the power supply is on
- check the health of the socket to which the PC is connected
- check the health of the PC power cable
- clean the computer
- check the health of the power supply
- check the health of the PC power button
- find out the presence or absence of swollen capacitors on the motherboard
- check the Bios battery, replace if necessary
- check the health of the hard drive (you can put your hand and if it vibrates, then everything is fine with it)
- check memory modules through all slots for their connection
If from all of the above, nothing helped, then you need to take the "patient" to a service workshop.
