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Fix Boot Device Not Found Error on Windows 10

Fix Boot Device Not Found Error on Windows 10


When you turn on your work computer that was working correctly and you see the message – Boot Device Not Foundthen you are more likely to panic. Along with the error message, you can also see a message asking – Please install the operating system on your hard disk, Hard Disk … You will also be prompted to press F2 to run system diagnostics.

What does the “Boot device not found” error mean?

When you install Windows to a disk, it becomes a bootable device. When the computer boots up, the BIOS or UEFI looks for the OS installed on that drive and continues the process. You can read about how Windows boots up here. Going back to the error code, when the BIOS or UEFI does not find any device it can boot from, it throws an error saying the boot device could not be found.

No boot device found

These are the troubleshooting tips you can follow to overcome No boot device found error. It could be a physical issue or a software issue.

  1. Check boot disk connection
  2. Change boot order
  3. Fix boot record from recovery
  4. Check if the main section is active

Be sure to prepare a bootable Windows USB drive. The last two options require you to boot into Advanced Recovery Mode in order to execute commands.

1]Check the connection with the boot disk.

If you are using a personalized computer with a cabinet, we suggest that you open it. Unplug any connected power supply and check the wires. The drives are connected to the motherboard with a cable. Check if both ends are well connected and not lost. It is recommended to disconnect and reconnect and see if the download works.

If you are using a laptop. You have two options. If you have the skills to help you open your laptop and test the connection, go ahead. If not, take it to a service center if none of the other tips helped.

2]Change boot order

When the computer boots up, the BIOS or UEFI checks the boot order. The order stated that you first need to look for a boot disk. If for some reason USB is connected to your computer and the first boot device is USB, then you have solved the problem. You can remove USB and boot, or enter BIOS and change boot order.

If you’re okay with your hardware, let’s try to fix it with software. Use a bootable USB stick, boot into Advanced Recovery Mode and open Command Prompt.

3]Fix boot record not found during restore

On the command line, we will use the bootrec command to repair the BCD or otherwise known as Boot Configuration Data. It contains boot configuration options on how to start Windows. If it is damaged, the BIOS will not be able to find the boot disk. You can use bootrec / rebuildbcd.

restore master boot record

Read our in-depth post on How to Recover Master Boot Record where we use the following command parameters:

bootrec /fixmbr

bootrec /fixboot

bootrec /scanos

bootrec /rebuildbcd

After that, when the computer boots up, it will detect the boot disk and boot Windows 10.

4]Check if the main partition is active.

Diskpart command activates partition

On a hard drive with multiple partitions, the one on which you install Windows is called the primary partition. In addition to being the primary section, it must be active. You need to use DiskPart tool to activate the partition. Since we do not have access to the GUI, we will execute it from the command line.

DiskPart list disk

select disk 0

list volume

select volume X (where x is the volume where Windows is installed)



After that, the main disk will become active, and you can boot into your computer without any problems. Make sure you select the correct volume; otherwise you will have to go back and change it again.

Hope this helped.

Related reads:

  1. No operating system
  2. Bootmgr is missing.


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