After flashing bios, the computer does not boot. Why the BIOS doesn't work. How to make a bootable diskette for updating BIOS

BIOS is the firmware responsible for starting Windows. She checks the functionality of components and add-ons. The correct boot of the computer and its normal operation (hardware components) depend on it.

It is recorded on the motherboard and not on the hard drive like the OS. In new devices, BIOS is replaced by UEFI, which performs the same functions, but is improved. Both programs sometimes need to be updated.

BIOS can be updated in several ways

DO I NEED TO UPDATE THE BIOS?

Manufacturers release updates for the laptop regularly. It is downloaded from the official website of the company that made the laptop. It is more difficult for PC owners to build their own. To find the files to update, they will have to rely on the data of the motherboard chip. Any update is also written to the chip, replacing the old version.

It is not difficult to update the bios correctly, but only materials designed for a specific PC model or board should be used. Each motherboard has a strictly defined type of firmware, and installing the wrong version can lead to malfunctions of the computer or its complete inoperability.

BIOS is a thin program, and therefore it is better to update it only in extreme cases. It does not need to be updated on a normally functioning PC. This is due to several factors:

• It is difficult to flash bios on an asus motherboard or any other, the process requires some skills, the process goes through DOS;
• Improvements will not be noticeable, as the differences between versions are minimal and highly specialized;
• Malfunctions and malfunctions may occur. the old version has been tested more thoroughly than the new one;
• During work, the power must not be cut off, otherwise the device will stop loading.

But sometimes it is necessary to update the BIOS. If you regularly encounter this or that error in operation, go to the device manufacturer's website and check if such an error has been eliminated in the new firmware version. More often on the websites of manufacturers there is such a list. If this problem is really solved in the new version, it makes sense to update the bios on the laptop.

Another good reason to flash BIOS is to install new equipment. If you have purchased a new processor that appeared after the release of your motherboard, then it will not be supported by your BIOS. Manufacturers add support for new types of processors to new versions for firmware, and therefore you will have to download such a file and flash the firmware.

You need to update the BIOS as a last resort. But even then, check the specifications of the new version before upgrading to see if the issues are resolved. Based on this, draw a conclusion whether it is necessary to update the bios.

Find out the current version by holding Win + R on the keyboard. In the window that opens, you see msinfo32 for 32-bit OS. Click the Run button. A window will open listing the hardware and OS characteristics of the device. Find the one you need among them.

Sometimes a notification appears that the bios mode is outdated. This means that the BIOS operating mode is outdated, it still works in real, not protected mode. The firmware may not help solve the problem, but it is not serious and does not need to be fixed.

UPDATE METHODS

The upgrade method depends on the computer manufacturer, motherboard model, etc. Most often, each manufacturer has its own instructions for flashing. You can get acquainted with it on the official website of the company.

On all modern motherboards, or you can update the bios on the computer in any of the indicated ways. But it is better to choose the latter, as it guarantees the minimum number of errors.

UPDATE ALGORITHM

You can update the bios of asus or any other modern laptop in any of the three described ways. They have their own nuances, but when carrying out the process using utilities, they are still not difficult.

FROM DOS

A difficult option with great risks. To update bios on a windows 7 computer, do the following:

1. Find out your motherboard model;
2. Download the required firmware version on the manufacturer's official website;
3. Sometimes there are several of them. In this case, select the one intended for installation in DOS mode;
4. Create a bootable USB flash drive with BIOS, DOS and additional utility (it is downloaded on the manufacturer's website or included in the archive along with the firmware);
5. Install a USB flash drive and restart your computer;
6. Specify the media on which the motherboard bios firmware;
7. After the flashing is finished, restart your PC.

More precisely, there is no instruction, since it varies for different PCs and boards. Find detailed instructions on the manufacturer's website. However, this method is not recommended.

FROM WINDOWS

It is easy to reflash bios on a laptop in this way. Errors are rare. Popular method.

1. Download the firmware utility. It is different for each manufacturer. Asus bios update software - Asus Update, MSI - Live Update, etc .;
2. Install the program;
3. Run;
4. Find the function online - search for new firmware. In different programs, she is in different groups of teams;
5. Select the required firmware from the list of firmware;
6. Activate download;
7. After downloading, run the flashing and follow the instructions of the program.

The bios firmware of asus, MSI and others is also safe in this way because the program itself selects the appropriate firmware version. In addition, the intuitive interface will help even an inexperienced user to perform the firmware.

FROM BIOS

It is possible to reflash bios on a laptop from the firmware due to the pre-installed utilities. This is a difficult method, as it differs depending on the motherboard chip model, manufacturer, etc. To update the bios on a gigabyte motherboard, run the pre-installed @BIOS utility, other manufacturers have other programs. Such programs are similar to the utilities used in the previous method, but not so convenient. They also work with them - they find the necessary file on the network and launch it.

Most often, the method is used in case of computer breakdowns, when it is impossible to enter the OS, because PC does not boot.

BIOS is the basic input and output system that stores the special algorithms needed for the entire computer to function properly. The user can make certain changes to it in order to improve the performance of the PC, but if the BIOS does not start, then this may indicate serious problems with the computer.

There is no universal way to solve this problem, since, depending on the reason, you need to look for a solution. For example, in some cases, in order to "revive" the BIOS, you will have to disassemble the computer and perform some manipulations with the hardware, while in others it will be enough just to try to enter it using the capabilities of the operating system.

Reason 1: Problems with components

If, when turning on the PC, the machine either does not show any signs of life at all, or only the indicators on the case are on, but there are no sounds and / or messages on the screen, then in most cases this means that the problem lies in the components. Inspect these components:

Physical damage to important components of the computer takes place, but the main reason for the inability to start the PC normally is the strong dust contamination of its insides. Dust can build up in fans and contacts, disrupting the supply of voltage from one component to another.

When disassembling a system unit or laptop case, pay attention to the amount of dust. If there is too much of it, then do the "cleaning". Large volumes can be removed with a low power vacuum cleaner. If you use a vacuum cleaner while cleaning, be careful as you can accidentally damage the inside of your PC.

When the main layer of dust has been removed, arm yourself with a brush and dry cloths to remove any remaining dirt. Contamination may have entered the power supply. In this case, it will have to be disassembled and cleaned from the inside. Also check the contacts and connectors for dust.

Reason 2: Compatibility Issues

In rare cases, the computer and BIOS may stop working due to incompatibility of any component that is connected to the motherboard. Usually, it is quite easy to calculate the problem object, for example, if you have recently added / changed the RAM bar, then most likely the new bar is incompatible with the rest of the PC components. In this case, try starting the computer with old RAM.

Less commonly, it happens when one of the components of the computer fails and is no longer supported by the system. It is rather difficult to identify the problem in this case, since the computer does not start. Various sound signals or special messages on the screen that the BIOS gives can be very helpful. For example, by the error code or beep, you can find out with which component of the problem.

In the case of incompatibility of certain components on the motherboard, the computer often shows signs of life. The user can hear the operation of hard drives, coolers, start of other components, but nothing appears on the screen. Most often, in addition to the startup sounds of computer components, you can hear any extraneous signals that are played by the BIOS or any important PC component, thus reporting a problem.

If there is no signal / message or they are illegible, then you will have to use this instruction to find out what the problem is:

If you completely assembled the computer (without finding the problematic element), connected all the devices to it and it began to turn on normally, then there can be two explanations for this behavior:

• Perhaps due to vibration and / or other physical impact on the PC, the contact from some important component came out of the connector. In the actual disassembly and reassembly, you simply rewired an important component;
• A system failure has occurred due to which the computer has problems reading a component. Reconnecting each item to the motherboard or resetting the BIOS will fix this problem.

Reason 3: System failure

In this case, the OS boots without any complications, work in it also proceeds normally, but if you need to enter the BIOS, you cannot do anything. This scenario is extremely rare, but it does take place.

The solution to the problem is effective only if your operating system boots normally, but you cannot enter the BIOS. Here you can also recommend trying all the keys to enter - F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, Delete, Esc... Alternatively, you can use each of these keys in combination with Shift or fn (the latter is relevant only for laptops).

This method will be applicable only for Windows 8 and higher, since this system allows you to reboot the PC and then turn on the BIOS. Use this instruction to perform a reboot and then start the basic input and output system:

If your operating system is Windows 7 or older, as well as if you have not found the item Firmware and UEFI Settings at "Additional parameters", you can use "Command line"... Open it with the cmd command in the line "Run" (called by the key combination Win + R).

You need to enter the following value in it:

shutdown.exe / r / o

After clicking on Enter the computer will reboot and enter the BIOS or offer boot options with the entrance to the BIOS.

As a rule, after such a login, the basic I / O system boots without any problems in the future, if you are already using key combinations. If re-entering the BIOS using the keys is not possible, then a serious failure has occurred in the settings.

Reason 4: Incorrect settings

Due to a failure in the settings, the hotkeys for entering may change, so if such a failure occurs, then it would be wise to reset all settings to the factory settings. In most cases, everything returns to normal. This method is recommended only in cases where the computer boots without problems, but you cannot enter the BIOS.

BIOS is the most important component of a computer, the activity of which is aimed at setting up the operation of the equipment, checking its operability, starting the operating system and more. One of the most frustrating situations a user can face is when the BIOS refuses to start.
Let's imagine a situation: suppose you decided to reinstall Windows on your computer, but in order to run the installation program, you must enter the BIOS. You have made more than one attempt to enter the BIOS, and all of them were unsuccessful.

Another situation: when starting the computer, first the user sees the BIOS interface, after which the computer proceeds to load the operating system. In some cases, the user may not see any image at all, that is, neither the BIOS window, nor anything else.

Reason 1: wrong key (combination)

First of all, you should question the correct hotkey you are using to enter BIOS. Unfortunately, you can only find out which key in your case is by experience, that is, it was not possible to enter the BIOS using one button, next time you should try another.

The process of entering BIOS looks like this: you send the computer to reboot or just turn it on and at the very first stage of turning it on, you start repeatedly and quickly press the hotkey for the BIOS.

There are a huge number of options for entering the BIOS (this is especially observed in laptops), but in most cases one of the following keys is found: F1, F2 and Del. If none of the keys helped to enter the BIOS, try googling your motherboard model (for a stationary PC) or laptop model on the Internet in order to find out how your device is entered into BIOS.

Reason 2: non-working or unsupported keyboard

And although in rare cases the user has the opportunity to enter the BIOS without a keyboard, in 95% of cases it is indispensable.

Needless to say, a computer keyboard must be in good working order? Be sure to test your keyboard by logging into Windows or by connecting it to another computer.

If everything is in order with the performance of the keyboard, then perhaps the problem lies in the unsupported BIOS keyboard. As a rule, a similar problem is observed in users of old computers (laptops), and if you use a wired or USB keyboard, then this possibility may well be.

If you have a wireless keyboard, accordingly, we will need to use a wired one to eliminate the possibility of such a cause. Especially older BIOS versions may lack support for the USB keyboard interface, but to check this, you will need to either connect an old keyboard with a PS / 2 connector or purchase a PS / 2 adapter for a USB keyboard.

Reason 3: inoperative USB port

The port to which the keyboard is connected must be sure to work. Try plugging your keyboard into a different port and retry entering BIOS.

Reason 4: conflicting devices

One of the devices on the computer may have malfunctioned, resulting in a conflict, which is why you cannot enter the BIOS.
Try disconnecting everything you can from your computer: drives, hard drives or solid state drives, all USB devices connected to the motherboard, PCI cards. If there is an integrated video card, then disable the discrete one, and then try to enter the BIOS again. If the attempt is successful, connect one device at a time to the computer to find out what is conflicting. Having identified the problem device, it is with it that you will need to deal with it (it is better to take it to the service center for diagnostics).

Reason 5: malfunction of the computer

If, when you turn on the computer, the BIOS starts to make sounds, but does not want to start, you should listen to the signals and record them. Often, the BIOS, using such signals, makes it clear what went wrong. There are a lot of tables on the Internet that decode sound signals for different versions of BIOS, using which you can quickly understand the cause of the problem and start fixing it.

Reason 6: problematic BIOS settings

As a rule, a similar cause of the problem occurs when the user makes changes to the operation of the BIOS. In this case, you should try to reset the BIOS to factory settings. As a rule, in most cases you will need to look under the case of the system unit, where on the motherboard you can find a special switch (CMOS jumper), which is set to position 1-2. To perform a reset, simply move the switch to position 3-4 for 15-30 seconds, after which you can return it to its previous position.

Reason 7: problems with the motherboard

The most unfortunate cause of this problem is that the motherboard is practically the entire computer. If you suspect a problem in its work, you can carry out a small diagnostic procedure.

First of all, you will need to inspect the motherboard itself: are there any oxidations, are the capacitors swollen. Any external changes indicate its malfunction, which means that all this must be eliminated. If there is oxidation, it must be carefully erased with an eraser. If the capacitors are swollen, they should be re-soldered to new ones.

If visually everything is fine with the motherboard, you should try the following:

1. Disconnect the computer from the network, and also remove all unnecessary devices: mouse, speakers, keyboard, any additional devices and cables. As a result, only a network cable and a monitor should be connected to the system unit.
2. Clear CMOS. To do this, you need to remove the battery from the motherboard for a few seconds and then reinstall it.
3. Remove all boards from all slots on the motherboard, leaving only the processor and speaker connected.
4. Start the computer and pay attention to the sound: if it is, then this tells you that the motherboard is working. If not, then everything is much sadder - she does not respond.

If you have confirmed the guess that the problem is in the motherboard, you should try to take it to a service center - it is quite possible that a specialist will be able to return it to work.

These are the main reasons that affect the lack of BIOS start. If you have any comments on the article, leave them in the comments.

Guess the riddle: it stands like a beehive hums. But the smoke does not come from the chimney, because this is not a native plant, but a computer on which the BIOS is damaged. And he hums because he is only capable of this now. Without bios, it's just a bunch of lifeless iron. Is it worth worrying about this? Of course not. After all, now you have a great bedside table!

A system unit as a bedside table? Well, I do not! We know how to make it work. Today we'll talk about how to restore the BIOS if it crashed.

What leads to a BIOS flashing

In IOS and its "descendant" UEFI, which modern motherboards are stitched with, these are special computer programs necessary for the initial configuration and control of PC devices until the operating system starts. They are stored in special flash memory chips on the motherboard, one of which is shown in the picture above. It seems to be a good storage place, reliable, but sometimes the BIOS becomes uncomfortable there and escapes. More precisely, it gets damaged and stops performing its tasks.

There are not too many reasons for damage to the BIOS, in some cases they are obvious, in others they are not. Here is a list of the most common ones:

• During the power outage of the computer.
• The flasher program (flasher) does not interact correctly with the firmware or flash memory chip.
• The BIOS version is flashed, not suitable for this motherboard. Yes, .
• If the update is carried out from under a running operating system - a system failure or software interference, for example, antivirus blocking.
• Incorrect user actions, for example, restarting the computer before the update installation is complete.
• Failure of the flash memory chip.
• Hidden errors of BIOS firmware. Sometimes this explains spontaneous “gatherings” that occur for no apparent reason.
• Electrical problems on the motherboard.

How do BIOS damage appear?

In most cases, the BIOS firmware is damaged partially, so the symptoms of failure can vary:

• When you press the PC power button, only the cooler is turned on, which immediately starts rotating at maximum speed. Occasionally, the LED indicators on the case and keyboard light up.
• One or several seconds after switching on, a cyclic restart begins. Externally, this is manifested by a cycle of spinning up and stopping the cooler, which are repeated while the power is supplied.
• When turned on, the power indicator lights up, the cooler does not spin.
• The computer shows no signs of life. This happens when the boot block, the BIOS bootloader, is damaged. This is the worst case.

There is no image on the screen. Not even the manufacturer's splash screen appears.

There are other forms of BIOS damage, more precisely, its area, which stores the configuration of the ME controller (part of the chipset) on motherboards working with Intel processors - the so-called ME-region. If there is a problem in this area, a computer or laptop may:

• Incorrectly loaded or not included at all.
• Shut down or restart at regular intervals.
• It is incorrect to regulate the rotational speed of the cooler, for example, to turn it at high revs regardless of the load.

Elimination of such failures consists in reading the BIOS dump, replacing the ME-region with a clean one and re-flashing it using the programmer. Since this is usually done by repairmen, not computer owners, we will not dwell on this. Better to do something that can be done at home without special equipment and the risk of finally sending your "iron pet" to the kingdom of eternity.

BIOS recovery without a programmer is possible only if you save the bootloader. It is sometimes possible to determine whether it has survived or not by indirect signs: flashing of the screen backlight, sound signals from the system speaker, reaction of the motherboard to switching on without RAM (sound or flashing indicators), etc. If the BIOS bootloader is intact, the first moments of work computers run normally, the failure appears a little later.

How to restore functionality to a motherboard with a failed BIOS

Asus

Many Asus brand desktop motherboards support USB Flashback, which is designed to quickly update and restore BIOS in case of failure. This does not require anything, except for a USB flash drive with a capacity of up to 4-16 GB and the BIOS file itself, which must be downloaded from the manufacturer's website from the section about your mother's model.

After downloading, the firmware must be renamed. For example, the file "Sabertooth X79" (model name) is renamed to "SABERX79.ROM", the file "Sabertooth Z77" to "Z77ST.CAP". Information on how the firmware file for your model should be named is most likely on the Asus website, but if you don't find it, check it out on the forums or in support.

Next, save the renamed BIOS on a USB flash drive formatted in FAT32 and connect it to the USB port marked “ Flashback" or " ROG Connect". It is advisable to turn off the computer before this, this will increase the chance of a successful recovery.

After connecting the flash drive, turn on the PC and press the " BIOS". Hold it down for about 3 seconds until the indicator light on the board starts flashing. Blinking indicates that the file has been successfully read and is being stitched into memory. When the firmware process is completed, the indicator will turn off.

If your board is from the budget segment or not too new, that is, does not support USB Flashback, most likely you can restore it in another way. If the computer is equipped with a floppy drive or optical drive, write the renamed BIOS file to the root directory of a blank floppy disk or CD, place it in the drive, turn off and then turn on the PC. The firmware will be completed when the drive indicator turns off. If there is no drive, use a USB flash drive.

Gigabyte

On Gigabyte boards with Dual (dual) bios, failures rarely occur, since in case of damage to the firmware in the main microcircuit ( Main_ BIOS) the dump from the backup ( Backup_ BIOS). As long as the main flash memory is functional and contains firmware, even damaged, the board remains operational.

Problems with starting the board with Dual_BIOS are possible in the following cases:

• The main microcircuit is missing or out of order.
• The microcode in the main chip is completely erased.
• The contents of both chips are damaged.

Some Gigabyte mothers are able to boot from the backup flash memory and use it as the main one. Another group of boards from this manufacturer uses a dedicated area on the hard disk as a backup media for BIOS. This is a less reliable option, but also better than nothing.

Gigabyte BIOS recovery from a backup is usually performed automatically, but if this does not happen, try unplugging the computer, wait a little, and then turn it on again.

MSI and others

Most Micro-Star motherboards use a firmware recovery technology very similar to ASUS's - using a flash drive, floppy disk or CD. Copy the BIOS to a blank media, connect it to the PC, press the shutdown button for 4 seconds, hold down the combination on the keyboard leftCtrl +Home (or Alt +Ctrl +Home) and without releasing the keys, turn on the computer. The beginning of the firmware process can be judged by the blinking of the flash drive or drive indicator.
BIOS on MSI board. On the right is the JSPI1 port for firmware on the programmer

On motherboards from MSI and some other brands that are more than 8-10 years old, the BIOS is flashed from a floppy disk. The instructions for AWARD and AMI BIOS are slightly different.

To recover the AMI BIOS, do the following:

• Rename the BIOS file downloaded from the motherboard manufacturer's website to AMIBOOT.ROM.
• Transfer it to the root of a blank floppy disk. Insert the floppy disk into the drive of the turned off PC.
• Press the left Ctrl + Home on the keyboard and turn on the computer.

To restore AWARD BIOS:

• Place the flasher and BIOS files on a floppy disk (usually downloaded in one archive).
• Create a text document on a floppy disk, which contains the name of the BIOS file with the bin extension. Rename the document to autoexec.bat.
• Further actions are similar to those given above.

By the way, some motherboard manufacturers post BIOSes on their websites only in exe format - in one bottle with a flasher for updating from under Windows. Sometimes such a file can be unpacked as an archive, but users often do not understand which of its contents is the firmware. There is no universal solution for such tasks. In order not to aggravate the problem, it is better to consult on specialized forums or in the manufacturer's technical support.

On some boards, before restoring the BIOS, you also need to remove the real-time clock (RTC) battery from the socket or rearrange (remove) the clear CMOS jumper. It is important to find out these points before starting the procedure.

Features of BIOS recovery on laptops

On laptops, as on Gigabyte boards, the BIOS is also often stored in two flash memory chips. But this is not Dual and it has no backups. Both chips contain different parts of the firmware, or one contains the main BIOS, and the other contains the multicontroller program. To prevent the device from turning on, it is enough to damage the microcode in at least one of them.

The recovery method for a failed BIOS on laptops is approximately the same as on desktops. The firmware file and the flasher program downloaded from the manufacturer's website (the latter is not always needed) are placed on a clean USB flash drive formatted in FAT32 / 16, connected to a de-energized device (just turning off the laptop is sometimes not enough, you need to disconnect the power supply and remove the battery), insert a charged battery in place, turn on the device and hold down the key combination. Different laptops use different keyboard shortcuts for this, for example:

• Ctrl (left only or both) + Home
• Windows + B (this and other letters are in the Latin keyboard layout)
• Windows + F
• Windows + M
• Windows + Esc
• Fn + B
• Fn + F
• Fn + M
• Fn + Esc.

The main work is to unpack and rename the BIOS files. Again, there is no single rule. In most cases, you have to get the firmware from exe-files, but! Many manufacturers include BIOSes for different revisions of one platform or a whole series of platforms in their programs, and it can be very difficult to choose the only file you need. In order not to be mistaken, read the instructions for the firmware of your particular model and the platform revision on the specialized forums. And feel free to ask questions.

I deliberately do not include in the article instructions for restoring BIOS's by flashing on a programmer with and without soldering, closing various contacts, hot swapping removable flash memory, etc., since all these methods are unsafe and require certain knowledge. However, among the readers, there are likely to be those who have done something similar on their PC and got good results. It will be great if you describe your actions in detail in the comments to the article. You are also encouraged to share negative experiences so that other readers, thanks to you, can avoid mistakes. In the comments, be sure to include the model name and revision of your motherboard, as well as the BIOS version you worked with.

BIOS is the Basic Input-Output System, the heart of the computer, without which the normal operation of other components and software is impossible. When you turn on the computer, the BIOS starts up first and only after turning it on, the operating system starts loading.

In theory, since Windows boots after the BIOS, reinstalling the operating system or adding another OS should not affect the normal operation of the BIOS. However, it is not uncommon for an attempt to install a second operating system to result in the BIOS not loading.

In this case, we can assume that the BIOS settings have gone wrong and restoring the default settings can solve the problem. To reset the settings, you need to carry out the following operations.

1. Disconnect the PC and monitor from the mains.
2. Open the system unit and remove the battery from the motherboard.
3. Wait a few minutes.
4. Replace the system battery.
5. Connect power to the computer and monitor.

After restarting, the BIOS will start to boot “as the first time”. If the problem disappears after doing this, it is recommended to format the bootable hard drive and reinstall the operating system. It is desirable that one that previously worked without problems. It is possible that the added operating system was damaged in the distribution.

Connection violations

Chances are good that the BIOS does not load due to gaps in the supply networks or data loops. To check this option, you first need to listen - does the cooler spin on the motherboard. The BIOS is part of the processor and therefore poor cooling of the motherboard leads to malfunctions.

Perhaps the contact groups of the fan have moved away, so it does not work. Then carefully inspect all cable and loop connections. Check if dust has accumulated on the motherboard or in the contacts. Dust is an excellent conductor of electric current, and it also creates electrostatic fields, to which electronics are very sensitive.

• Clean the device from dust with a vacuum cleaner and a brush.
• Disconnect contactors in sequence and clean the terminals from dirt and oxidation. You can use a school rubber band to clean the contacts.
• Check that all connectors are secure. It is likely that the vibration caused the contacts to disperse, and therefore the equipment stopped working correctly.

After preventive maintenance, you can try to restart the computer. Is the screen black again and the BIOS won't load? Then it can be assumed that one of the internal modules is faulty. Including the motherboard itself could fail or it needs to be reflashed.

You can download the new firmware for the motherboard on the manufacturer's official website. Updating the firmware is a difficult and rather risky task. Therefore, if you do not know exactly what and how to do, it is better not to risk it, otherwise you can ditch the entire computer, in a place with hard drives. Better contact the service center.

Faulty blocks in the computer

None of the above helped? Then the probability of hardware malfunction increases and you can start checking the blocks.
Unplug and remove anything from the device that is not required to start the computer. Leave only the motherboard, power supply, and one of the RAM sticks. The computer will not work in this state, but it is possible to check the health of the motherboard itself.
A common reason for the inability to start a computer is insufficient power supply. For example - you replaced the motherboard with a more advanced one that requires more electricity. At the same time, the power supply remains old. Or so - additional hard disks or some other functional components were installed in the system unit. Energy consumption can rise quite dramatically. Installing a more powerful PSU will solve the problem. If the question, of course, is the lack of energy.

Often a malfunction in the video card prevents the BIOS from loading. If possible, you need to check the video card by replacing it with another similar one. Or install the video card in another computer. Here you need to look at the compatibility of the equipment. Otherwise, you will not find the problem, but you can create new faults.

If in the minimum configuration - a motherboard, a power supply, a RAM socket - the system unit is working and the BIOS is loaded, then the problem is in one of the removed modules. After installing and connecting the next unit, try turning on the computer again and see what happens. As soon as Bios stops starting again, it can be assumed that you have found a faulty unit. Now all that remains is to find a similar one and replace it.

In reality, everything is often much more complicated. For example, the computer sometimes boots up and works quite normally, and then, for no apparent reason, starts to glitch. The problem can be either a software malfunction or a component malfunction.

These periods of normal operation, interspersed with failure to boot the BIOS, are common for three types of problems.

1. The presence of microcracks on the motherboard. Because of this, the contact periodically disappears.
2. The electrolytic capacitors on the motherboard or power supply are dry. This malfunction mainly applies to old system units that have been in operation for a long time. Sometimes defective capacitors can be identified by the characteristic bulging of the case.

Poor contact in connected wires. As already mentioned - the presence of dust, oxidation of contacts, insufficient pressure. If the contactors have fixing screws, they must be tightened to the end. The opposite situation also happens - too tightly clamped screws-retainers lead to deformation of the connectors and disruption of contact in the connection.