The BIOS is the Basic Input/Output System, the heart of the computer, without which other components and software cannot function normally. When you turn on the computer, the BIOS starts first, and only after turning it on does the operating system start loading.
Theoretically, since Windows boots after BIOS, reinstalling the operating system or adding another OS should not affect the normal BIOS operation. However, it is not uncommon for an attempt to establish a second operating system causes the BIOS to not boot.
In this case, it can be assumed that the BIOS settings have gone astray and restoring the default settings can solve the problem. To reset the settings, you need to carry out the following operations.
- Disconnect PC and monitor from electrical network.
- Open the system unit and remove the battery from the motherboard.
- Wait a few minutes.
- Replace the system battery.
- Connect power to the computer and monitor.
After restarting, the BIOS will start to boot “like the first time”. If after that the problem disappears, it is recommended to format the bootable HDD and reinstall the operating system. Preferably one that previously worked without problems. It is possible that the added operating system was damaged in the distribution.
Connection violations
There is a high probability that the BIOS does not boot due to breaks in the power supply or data loops. To check this option, you first need to listen to whether the cooler rotates on motherboard. The BIOS is part of the processor and therefore poor cooling of the motherboard leads to malfunctions.
It is possible that the contact groups of the fan have moved away, which is why it does not work. After that, carefully inspect all cable and daisy chain connections. Check if dust has accumulated on the motherboard or in the contacts. Dust is an excellent conductor electric current, and even creates electrostatic fields, to which electronics are very sensitive.
- Remove dust from the device with a vacuum cleaner and a brush.
- Disconnect the contactors in sequence and clean the terminals from dirt and oxidation. You can use a school gum to strip the contacts.
- Check the security of all connectors. It is likely that the vibration caused the contacts to separate, and therefore the equipment stopped working correctly.
After prevention, you can try to restart the computer. Again the screen is black and the BIOS does not 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 a new firmware for the motherboard on the official website of the manufacturer. Updating the firmware is a complex and rather risky task. Therefore, if you don’t know exactly what and how to do it, it’s better not to take risks, otherwise you can ruin the whole computer, in a place with hard drives. Please contact the service center.
Bad blocks in the computer
None of the above helped? Then the probability of iron malfunction increases and you can start checking the blocks.
Unplug and remove anything from the device that is not necessary to start the computer. Leave only the motherboard, power supply and one of the brackets random access memory. 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 the computer is the insufficient power of the power supply. For example - you replaced the motherboard with a better one, which requires more electricity. At the same time, the power supply remained old. Or so - additional hard drives or some other functional components were installed in the system unit. Energy consumption can rise quite a lot. Installing a more powerful power supply will solve the problem. If the question, of course, is the lack of energy.
Often, BIOS loading is prevented by a malfunction in the video card. 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 malfunctions.
If in the minimum configuration - a motherboard, a power supply, a RAM socket - the system unit is working and the BIOS is loading, then the problem is in one of the removed modules. After installing and connecting the next block, try turning on the computer again and see what happens. As soon as the BIOS stops starting again, it can be assumed that you have found a faulty block. Now it remains only to find a similar one and replace it.
In reality, things are often much more complicated. For example, a computer sometimes boots up and works quite normally, and then, without apparent reason, starts to glitch. The problem may be as in violations in software as well as component failures.
These periods of normal operation, alternating with the inability to boot the BIOS, are characteristic of three types of problems.
- The presence of microcracks on the motherboard. Because of this, contact periodically disappears.
- Dry electrolytic capacitors on the motherboard or in the power supply. This malfunction mainly refers to old system units that have been in operation for a long time. Sometimes faulty capacitors can be identified by a characteristic swelling of the case.
Bad contact in connected wires. As already mentioned - the presence of dust, oxidation of contacts, not enough strong pressure. If the contactors have fixing screws, they must be tightened to the end. The reverse situation also happens - too tightly clamped fixing screws lead to deformation of the connectors and disruption of contact in the connection.
Even the most cautious users will eventually have to log into the computer's base system on their own. To be afraid, to do something wrong is normal, which cannot be said about the manifestation of the reverse reaction - the frivolity of newcomers, driven by irresistibility, to test the microsystem in action. However, both some and other users may have a question: “The computer does not enter the BIOS: what to do”, even if the “same” service key for calling the basic microsystem of the computing device is used to enter. It will be interesting to everyone, and even to you an advanced user!
Introductory Theory of "Untriggerability"
Let's leave the dull story about what BIOS is and why it is needed at all ... You need to know one thing - BIOS, this is not the place where you can thoughtlessly conduct experiments. Before you change any parameter or make a certain change in the operation of the microsystem, you need to understand that the result may turn out to be deplorably unexpected. Therefore, we turn on our brains and get down to business.
Energy "CMOS-trouble" - the battery is dead
The one who knows what is at stake will smile. Although it is not a fact that when the situation “The computer does not enter the BIOS” occurs knowledgeable user immediately draws attention to the battery, which keeps the CMOS memory chip, so to speak, in good shape.
Sometimes an advanced computer scientist takes a roundabout way - he tries to reflash the BIOS or exposes the system to a kind of software "shock therapy" by loading various DOS utilities and trying to resurrect the "maternal instinct" of the bootability of the control system.
In fact, the first thing to do when the problem we are considering occurs is to replace the CMOS battery and reset BIOS settings to default values.
Where is the "main" battery located and how to reset the BIOS?
The location of the battery may depend on the modification of the computing device, its type and other design features of the device. When it comes to laptops, access to the battery is often incredibly difficult, as often the battery is hidden deep in the bowels of a compact device. However, referring to the material of the article, which is , you will be able to reset the BIOS settings without carrying out the difficult process of dismantling the laptop frame.
In the case of desktop computers, everything is much simpler - we disconnect the power cable from system block, remove the protective cover and without much tension, we immediately find a large button cell battery. Naturally, it must be dismantled, and before putting a workable battery in its place, close the contacts of the battery socket with any metal object (static, you know!). After that, proceed to the operation "reset user settings".
Mechanical method - closing special connectors with a jumper or clicking on the "Clear" button
Some manufacturers supply their motherboards with a special button, pressing which allows you to clear the CMOS memory and return the BIOS settings to, so to speak, their original state - the factory one. However, most motherboards equipped with a more ascetic reset mechanism - a three-pin breaker, the location of which can be easily calculated by marking "CLR CMOS".
So, in order (by default, we de-energized the computing device and removed the protective cover):
- Typically, the reset pin mechanism is in close proximity to the CMOS battery. However, in the photo below, the jumper is in a different place on the board.
- The operating position of the jumper is "1-2" - move the contactor one position forward / backward, in accordance with the marking applied to the motherboard. Regarding the graphical example (above the figure) - this is the position "2-3".
- Wait a couple of minutes and install a new battery in the battery connector.
- If the motherboard is equipped with a special button, activate it.
- Close the cover and connect the power cable to the system unit.
- Turn on your computer.
If everything went well, which is called “Hurrah”, then pressing the “necessary” button will take you to the interface basic settings, no - we continue to look for the cause.
Keyboard "passions", or Why can't I enter the computer's BIOS?
Sometimes, especially for portable electronics, the culprit of "uncontrollability" is directly the keyboard module. Make sure that none of the keys is stuck, that is, is not in the closed (pressed) state.
Perhaps some unfortunate incident that happened the day before will come to mind - a spilled cup of coffee, for example.
In any case, it's worth trying the "connecting an external keyboard via USB" option.
If the prerequisites are correct, you need to replace the keyboard module. For desktop computers The most acceptable test scheme is to connect a known-good keyboard to the PS/2 connector.
Hard case - "hard" problems
The inability of the computer BIOS system to start or to complete the full initialization process can be caused by a malfunction of any hardware component of the computer. Most often, the reason lies in the incapacity hard drive. By the way, do not neglect the importance (issued by the BIOS system) of sound signals. Learn more about "beep" codes . This kind of knowledge incredibly simplifies the process of finding a specific problem.
It is not uncommon for a favorable boot scenario to be disrupted by a malfunction of the front connection panel, to which external audio and other peripherals are connected. Try disconnecting the external controller cable from the motherboard.
Check if the problem “the computer does not enter BIOS” has been resolved, if not, turn off the hard drive and restart the computer. In the end, if possible, experiment with RAM sticks - check their performance, so to speak, by alternate connection. All of the above also applies to laptops. Perhaps information from it will come in handy for you.
In addition to what has been said
So, you, dear reader, have familiarized yourself with the basic methods for eliminating the causes when the computer does not enter the BIOS. We dare to assure you that the described troubleshooting algorithm is the most optimal. However, if your BIOS simply crashed, then you still can’t do without flashing the CMOS chip (see the article, which is located ). Happy renovation to you!
Updated: 02/26/2020 Published: 13.03.2018
Description
Every time you turn on the computer, the BIOS immediately opens (a blue window with settings). After exiting it, either the system starts up, or only the BIOS is loaded again.
Very often, this can happen with laptops from ASUS, MSI or Samsung.
Cause
Typically, the problem is caused by the BIOS not being able to find the device from which the operating system should boot. This can happen for the following reasons:
- The settings of the basic input/output system have gone wrong;
- There are no media to run the operating system or its malfunction;
- Software error BIOS;
- Computer malfunction warning - launching the menu signals the presence of wrong setting, which can lead to failure of the PC itself. For example, incorrect bus frequency.
It is also possible that the BIOS startup key (usually Del or F2) is simply stuck - because of this, a constant basic input output system occurs.
Solution
Solutions are ranked in order of ease of diagnosis and probability of occurrence.
1. Enable Launch CSM (BIOS / UEFI mode)
In the case of using systems that do not support UEFI (for example, Windows 7), it is necessary that the "Launch CSM" option be enabled (this option is responsible for compatibility with older operating systems). If it is disabled, first find the option " secure boot- turn it off and restart the computer. Then we activate Launch CSM. After that, you can try restarting your computer.
We check if there is a Boot Device Control section and the ability to choose between options such as: UEFI and Legacy, UEFI Only, Legacy Only. For older versions of the system, you should choose Legacy and UEFI Only or Legacy Only. For new systems, you need to try different options.
Some BIOS / UEFI versions have an option to select the type of operating system - there may be Windows options 8(7) and Other OS. For systems that do not support UEFI, select the latter option.
2. Checking the disk drive
We check the health of the disk on which the operating system (or bootloader) is installed. For this you can:
a) See if the BIOS sees the disk in the section Main.
b) Disconnect the disk from the computer and insert it into another, checking that it is detected and data can be read from it.
12. Date and time setting
We go into the BIOS and check the correctness of the date and time. If they are incorrect, then we set the correct values. Apply the settings and exit the BIOS.
If the date and time are lost when the computer is turned off, the motherboard battery needs to be replaced.
13. Disable Fast Boot
Disabling fast boot in BIOS can also help. To do this, we find the option fast boot and move it to the position Disabled. The option itself can be found in one of the sections:
- Advanced - OS Configuration
- BIOS Features
* Please note that the similarly named "Quick Boot" option has a different purpose and does not affect our setup in any way, so you do not need to touch this option.
14. Bootloader recovery
Due to system boot problems, the computer will constantly run BIOS. The operating system may not start due to problems with the bootloader.
To solve the problem, run . After that, in the command line, we execute 2 commands:
bootrec.exe /fixmbr
bootrec.exe /fixboot
We check the system startup. If this does not happen, run the commands:
bootrec.exe /scanos
bootrec.exe /rebuildbcd
* using these commands, we will scan the disk for operating systems and write the found systems to boot.
Again we check the start of the system.
15. System recovery
The issue can be resolved using a checkpoint restore tool. Again we start system recovery from the Windows installation disk. After we do a system rollback.
We try to select a point at the moment when the system started normally.
16. Update BIOS
To update the BIOS, download the latest version from the website of the motherboard developer. Instructions are attached to the downloaded archive - we carefully study it and perform step-by-step actions.
If your computer already has latest version BIOS, then install it again (reflash the BIOS).
The BIOS is a basic input and output system that stores special algorithms necessary for the proper functioning of the entire computer. The user can make certain changes to it in order to improve the performance of the PC, however, if the BIOS does not start, then this may indicate serious problems with the computer.
There is no universal way to solve this problem, because, depending on the cause, 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 carry out 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: Component problems
If, when you turn 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. Check out these components:
Physical damage to important computer components takes place, but the main reason for the impossibility of starting a PC normally is severe dust contamination of its insides. Dust can get into the fans and contacts, disrupting the power supply from one component to another.
When disassembling the 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 vacuum cleaner operating at low power. If you use a vacuum cleaner while cleaning, then be careful, as you can accidentally damage the inside of the PC.
When the main layer of dust is removed, arm yourself with a brush and dry wipes to remove the remaining dirt. Possibly dirt got into 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 the incompatibility of any component that is connected to the motherboard. Usually it is quite easy to calculate the problematic object, for example, if you have recently added / changed a RAM bar, then most likely the new bar is incompatible with other PC components. In this case, try starting the computer with the old RAM.
Less commonly, it happens when one of the computer components fails and is no longer supported by the system. It is quite difficult to identify the problem in this case, since the computer does not start. Various beeps or special messages on the screen that the BIOS gives can help a lot. For example, by error code or sound signal 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 hard drives, coolers, launch 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 the BIOS or some important PC component plays, 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 a problematic element), connected all devices to it and it began to turn on normally, then there can be two explanations for this behavior:
- Possibly due to vibration and/or other physical impact on a PC, a pin from some important component has come out of the socket. In the actual disassembly and reassembly, you have simply rewired an important component;
- A system failure has occurred due to which the computer has problems reading any component. Reconnecting each item to the motherboard again or resetting the BIOS fixes this issue.
Reason 3: System failure
In this case, the OS loads without any complications, work in it also proceeds normally, however, if you need to enter the BIOS, you can’t do anything. This scenario is extremely rare, but it does happen.
The solution to the problem that has arisen is only effective 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 only be applicable for Windows 8 and higher, since this system allows you to restart the PC, followed by enabling BIOS. Use this instruction to reboot and then start the basic input and output system:
If you have an operating Windows system 7 and older as well, if you haven't found the item "Firmware and UEFI Settings" V « Additional options» , you can use « command line» . Open it with cmd commands in 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 restart and enter the BIOS or offer boot options with entering the BIOS.
As a rule, after such an entrance, the basic I / O system is loaded without any problems in the future, if you are already using keyboard shortcuts. If it is impossible to re-enter the BIOS using the keys, 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, it would be wise to reset all settings to factory settings. In most cases, everything returns to normal. This method is recommended only when the computer boots without problems, but you cannot enter the BIOS.
Sometimes after some laptop models stop loading the operating system. Instead, when turned on, they automatically enter the BIOS immediately. There, if you view the boot list (), you can notice that it is empty. That is, it does not have a hard drive or DVD drive, nor bootable flash drive, which you could insert into USB port. Although at the same time they are all connected and can even be displayed in the BIOS among the connected devices.
What to do in this situation and how to return the laptop to working condition on your own at home?
Why is this happening?
In most cases this situation occurs, as mentioned above, after resetting the BIOS settings. And it is not necessary to do this through the corresponding menu. It is enough to get the battery in the laptop for a few minutes and disconnect it from the mains. Updating the BIOS and from dust also often leads to its reset.
In some versions of laptops, especially after 2016, there are various options in the BIOS, the incorrect installation of which leads to the prohibition of booting from a hard drive or flash drive. Therefore, when the laptop is turned on, it enters the BIOS itself, since it does not see a single device from which it could continue to boot.
How to fix this situation?
For this in BIOS settings, which appear on the screen immediately after turning on the laptop, you need to find the option and disable it, that is, put it in the Disabled state. It may be called slightly different, such as Fast Boot, and is usually located on the Advanced or Boot tab. IN Asus laptops with a UEFI system in the main window, you need to press F7 to activate advanced mode.
Fast boot option
Once you have disabled Fast Boot, immediately save the settings with the F10 button, then restart the laptop and enter the BIOS again.
Next, on the Boot or Security tab (perhaps in our case on other tabs), you need to find the option and also disable it by transferring it to the Disabled state, and the UEFI and Legacy OS (CSM - Compatibility Support Module) (OS Mode Selection) parameter must be set to CMS OS or Other OS or Legacy.
Secure Boot option
OS Mode Selection option
Now we save the settings with the same F10 button, reboot and check. The laptop should start loading Windows.
If this does not happen, then try to find the Legacy Support option in the BIOS and set it to Enabled. Also, if there is a parameter, then it must be used by selecting it with the "Enter" button and entering the code from the displayed message.
"Clear All Secure Boot Keys" option in BIOS
If nothing helped?
In this case, there is a possibility that there are serious problems with the hard drive. You need to try and replace it with another known working one.
