The computer boot is interrupted at the very beginning and a message appears on the screen: “No bootable device - insert boot disk and press any key” - “No boot device found”. What is the reason? How to fix a similar problem? In our article, we will briefly answer these and other questions.
When a computer is working properly, we don't feel much desire to understand "how everything works in it." However, when a computer crashes, it stops loading, and "mysterious" error messages appear on the screen and we do not have the opportunity to call a computer specialist for help, then we are forced to look into the "inner world" of the computer in order to return it to working condition . Let's understand what the "No boot devices found" error message means.
What does it mean and how to fix the error "No bootable device"?
The computer has built-in software that functions independently of the operating system. This software is embedded in the flash memory of each motherboard and is called the BIOS (Basic Input/Output System). Its tasks include loading devices and various computer components. After polling and testing computer components, the BIOS passes control to the operating system. It is the BIOS that tells us by displaying a warning that no boot device was found. This happens when the BIOS is unable to boot the operating system from any media on the computer. A "boot device" can be media such as HDD, CD, DVD, floppy disk or regular "flash drive", which may contain boot information or operating system. If this device is missing, turned off, or there are problems with the operating system, then the aforementioned error message appears. Make sure that in the BIOS menu "and the boot device is selected partition hard drive or any other device that you plan to use as bootable.
Now we will tell you about three possible reasons that can lead to such an error.
File system issues
The most likely reason for the BIOS not being able to detect the boot device is a failure of the operating system installed on the hard drive. This can happen due to a virus attack, accidental deletion system files or accidental compression of the system disk, i.e. any reason due to which the existing working settings of the operating system may be violated. In this scenario, when the system starts up, the operating system is not detected and you receive this error message.
Decision:
The only way out in this situation is to boot from the installation Windows disk, followed by restoring or reinstalling the operating system. In case of recovery, you will be able to save all data on the restored partition, in case of reinstallation, the data will be lost.
Hard drive disabled
In rare cases, it happens that the BIOS cannot detect the hard drive as a boot device because it may have been physically disconnected from the motherboard. This can happen if the system unit has been dropped or hit. To verify that this is indeed the case, go to BIOS settings by pressing the corresponding key at system startup (F1, F2, Del, other options are possible).
Decision:
In this case, you need to open the case of the computer's system unit and check if the cable from the motherboard to the hard drive is properly connected. If it is disconnected, then just plug it in and the problem will be solved. In the case of a laptop, you will have to do the same. If your laptop or desktop computer are under warranty, it is better to give the computer to the service center specialists.
Hard drive damage
Physical damage to the hard drive or the appearance of bad sectors can cause the error to appear. The hard drive can be damaged by power surges, dust, shock, etc. In the event that the hard drive is damaged, it is not detected by the BIOS.
Decision:
In this case, you may need to replace the hard drive. The hard drive needs to be tested for bad sectors. In case of restoration of its working capacity, it can be used as a secondary carrier.
If none of the above measures helped you, then you need to contact for computer help to the experts. At least your conscience will be at ease, because you did everything you could. In addition, we do not recommend that you open and repair a computer that is still under warranty. It is better, as mentioned above, to hand it over to the service department. Since if it turns out that any element needs to be replaced, you do not have to buy and change it with your own money.
The most likely cause of this failure is usually problems with the operating system affected by a virus attack or corrupted system files. In most of these cases, you will have to reinstall the operating system. To avoid such problems, it is recommended to install anti-virus software that effectively prevents virus-induced crashes in the system.
Probably, there is no need to explain how unflattering the situation is when a user turns on a computer or laptop to boot and instead of the usual start, the system writes Operating on the screen for no reason at all. System not found. For many users, this is a real shock. How so? Yesterday, everything worked… What could have happened, and how to fix this situation, we'll see now.
What does the Operating System not found error mean?
If you look at the message itself, it's not hard to translate it as "operating system not found". But here's the problem - the user is absolutely sure that it exists. But the computer system does not share such confidence with the user, because it simply does not find the components responsible for loading the system.
In general, such situations most often appear, for example, when a user removes a hard drive and replaces it with a new one. Maybe just the hard drive is out of order, but you never know what.
Possible causes
If such an incident suddenly turned out, and the system constantly displays the message Operating System not found (Windows 7, 8, etc.), first of all, do not panic. To get started, just check if a flash drive is inserted into the computer or laptop, and in the BIOS settings, the USB device is the priority for booting.
If the hard drive was removed or changed to a new one (this applies to desktop computers), it may very well be that when it was reconnected, the corresponding cables were connected incorrectly or loosely. Let's see what can be done in such a situation.
Basic BIOS settings
by the most in a simple way Changing the BIOS settings can reset all settings to factory defaults (Default). Every BIOS version has this setting.
In extreme cases, you can simply change the boot priority in the Boot Device Priority or Boot Sequence section, and install the hard drive as the first (main) boot device (boot device).
It also happens, however, that the hard drive is detected in the BIOS, but it still does not boot, and the system again and again gives the Operating System not found warning. What to do in such a situation? First see if it's worth it models of hard disk It signals that the device in the system, although it is present, is simply disabled or not involved.
As a rule, in most versions of the BIOS on the right there is a special help field for the device (Specific Item Help), which contains a keyboard shortcut that allows you to enable or disable any component. The most likely combination is Shift + 1. But here everything depends on the manufacturer (combinations may be different).
Switching hard drive operating modes in BIOS UEFI
On the other hand, if an Operating System not found warning appears on a laptop, where it is quite problematic to remove the hard drive, you should separately pay attention to the settings of the hard drive operating modes. As an example, consider the settings latest system UEFI, although they can be used in other versions without problems.
In general, there are two main modes in the SATA configuration: AHCI and IDE. During the initial installation of the OS, as well as in the default settings, AHCI mode is enabled. When you switch to the IDE, no matter how you try, you won't be able to install Windows on the hard drive.
The same applies to moments when users, at the end of the installation process, either out of ignorance or accidentally turn on IDE mode. As it is already clear, the system issues the line Operating System not found. Incidentally, even if this moment put another fully functional “screw”, without changing the SATA settings to the initial ones, it will also not work.
Therefore, it is immediately worth advising users to change such settings only as a last resort, when it is really necessary.
Restoring the Windows bootloader
There are also frequent cases when the message “Operating System not found” appears when the Windows bootloader, which is associated only with errors on the hard disk, for example, due to incorrect shutdown. In this case, as is already clear, the entire system can “fly off”.
In such a situation, you can try to restore the bootloader, and at the same time check system disk or section for errors. To do this, it is always desirable to have the original at hand. installation disk or system recovery disk.
Here you will need to set the optical drive in the BIOS as the first priority device for booting, and then use it. Note that in this option there is no question about Windows recovery from the checkpoint. This still won't help and the Operating System not found warning will reappear.
Here you need to use boot recovery mode or command line which is preferable. In it, you need to sequentially enter two main commands: bootrec.exe /FixMbr and bootrec.exe /FixBoot, after each pressing "Enter". If such a sequence does not help, in addition, you can add the bootrec.exe /RebuildBcd command.
Before performing such actions, it is strongly recommended to check for errors with their automatic correction (commands chkdsk / f / r or chkdsk / f / x / r). You can also use the chkntfs /x c: checker if you have file system NTFS in system partition(drive "C").
If nothing helped
However, if all the above methods of correcting the situation do not help, then you should definitely diagnose the hard drive. But if it’s not a problem to remove it, then you will have to contact the nearest service center or a workshop and do not attempt to remove it yourself.
As it is already clear, if the hard drive “fell down”, there’s nothing to be done, you will have to change it to a new “hardware”, and then install the “OS” again. You can, of course, try out the action of the utility on it, but it is quite difficult to guarantee one hundred percent success.
In the section on the question Help please, does not enter the BIOS! given by the author Nikolaj Fafaga the best answer is pull the battery out of the mother for a minute.
Ruslan Asanov
Enlightened
(21998)
And at this time the wire was disconnected?
Answer from 22 answers[guru]
Hey! Here is a selection of topics with answers to your question: Help please, it does not go into the BIOS!
Answer from Neurologist[master]
pull the battery, go through another computer to the website of the manufacturer of your motherboard. go to downloads on this site and download your bios file. put it on a flash drive. disconnect hard. plug it into another computer, but be sure to turn on ntivir in real time. drop only the most important files!! ! Do not download any games or programs. format your hard. plug it back into your computer. insert the battery. insert flash. and download from it. in your case, it will load itself. if not then press F3 (as in your 2nd photo) to scan!! ! if so, then you need to go into instal flash when you boot your computer. a window with the logo of your motherboard should come out and press the appropriate button. it will be written there. and find your flash drive there and find the downloaded file. download it. bios install and install new Windows. You most likely ate a tasty virus because of some game or program. be careful.
Answer from legal capacity[guru]
BIOS - No BIOS file foundwww. cyberforum.ru/bios/thread789137.html
Answer from placer[guru]
Bios decided to reflash and do not understand what you are doing? ? Here we got it! Now flash again if you can do it.
Instruction
open Computer BIOS. To do this, press the power button or reboot. Right after sound signal press the DEL key. You can click it several times - modern computers they load so fast that it's hard to catch the right moment, so feel free to click and the BIOS will open. On some models of motherboards, the button to enter the BIOS settings can be F2, F12 or F10 - this information is in the instructions, as well as in the bottom line of the screen during boot. If everything is done correctly, the system setup menu will appear on the screen.
Find the factory reset menu. Look for the inscription Load fail safe defaults or Load Default settings. Navigate through the menu categories using the arrows on your keyboard. Press the Enter button when you find the appropriate setting item. This will reset all changes, which means all possible mistakes BIOS will be fixed.
Find the Save & Exit menu and press the Enter button. A message will appear on English language, which will ask you to confirm the changes. Press Enter or Y to save changes. The computer will shut down and boot up with the new "start" settings. During the startup process, a message may appear stating that you must press F1 to continue downloading. Press this key and continue to start the computer.
You can reset all BIOS settings by removing the battery. This is alternative way, which helps in cases where the computer does not allow you to enter the system setup or does not boot at all. Disconnect all cables. Take a Phillips screwdriver and a flathead screwdriver.
Remove the screws from the back of the system unit. Remove the side cover. Find a round, shiny battery about an inch and a half in diameter. The socket in which this battery is located has a protrusion-lock. Pry this tab with a screwdriver and pull out the battery. Leave everything for 10-15 minutes - without power, all settings will be reset, and this will fix errors in the BIOS.
Install the battery in the motherboard, observing the polarity; the side with the inscription should be on top. Connect all devices to system unit, connect the power cord. You can turn on the computer.
Replacement software motherboard allows you to improve the performance of your computer and add new features related to its configuration. This process should be performed only after careful preparation and reading. necessary instructions.
You will need
- - Firmware file;
- - program for firmware.
Instruction
If you have already updated the BIOS and want to return to the old version, then download the correct firmware. To do this, it is better to use the official website of the manufacturer of the motherboard used. If you are working with a laptop, then visit the website of the developer of this model mobile computer.
Download the flash driver and the required software version from there. If you did not find the original BIOS version, then download a newer firmware that is minimally different from the original one. Usually sites indicate the release date of the firmware.
Reset your BIOS settings before starting the software change process. To do this, open this menu after restarting your computer. Select Use Default Settings or Reset CMOS and press the Enter key. Confirm the operations by pressing the Y key.