Ways to Fix Default Boot Device Missing or Boot Failed on Computer

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Ways to Fix Default Boot Device Missing or Boot Failed on Computer

Some Acer or Lenovo computer users say they come across the error of default boot device missing or boot failed on computer when starting up the computer. This Windows startup error may be caused by a lot of reasons, such as incorrect BIOS settings, incorrect boot order, failed hard drive, or missing boot files, etc.

So, in this post, we will show you how to fix the error of default boot device missing or boot failed on Lenovo/Acer computer.

Way 1. Change BIOS Order

As we have mentioned above, the error of default boot device missing or boot failed may be caused by the incorrect boot order. So, in order to fix this problem, you can check the boot sequence first.

Now, here is the tutorial.

  1. Restart your computer.
  2. Press the hotkey once you see the Windows logo appears. Then you will enter the BIOS.
  3. In the BIOS setup window, navigate to the Boot
  4. Then check whether your hard drive containing the system is in the first place. If not, change the hard drive boot order.
  5. Then highlight Boot Mode, change UEFI to Legacy boot.
  6. After that, save the changes.

Once all steps are finished, reboot your computer and check whether the error of default boot device missing or boot failed is fixed.

Way 2. Set Primary Partition as Active

In order to fix the problem of default boot device missing or boot failed, you can try to set the primary partition as active.

Now, here is the tutorial.

As your computer is unbootable, you need to create a Windows installation media first. If you already have one, just skip this step. To create a Windows installation media, download Windows Media Creation Tool to do that. Then go on based on the following guides.

  1. Connect the bootable drive to the Windows installation media.
  2. Then select language, time and keyboard input.
  3. Click Repair your computer.
  4. Choose TroubleshootCommand Prompt to continue.
  5. In the Command Prompt window, type the following commands:

diskpart

list disk

select disk 0

list partition

select partition 1

active

  1. Then close the command line window.

Once all steps are finished, reboot your computer and check whether the error of default boot device missing or boot failed is solved.

Way 3. Run Startup Repair

In order to fix the error of default boot device missing or boot failed, you can try running the Windows built-in tool – Startup Repair.

Now, here is the tutorial.

  1. Boot your computer from the Windows installation media.
  2. Then select the language, time and keyboard input.
  3. Then click Repair your computer.
  4. Next, click TroubleshootStartup Repair to continue.
  5. Then it will scan and repair the problems on your computer.

When it is finished, reboot your computer and check whether the issue of default boot device missing or boot failed is solved.

Way 4. Replace Hard Drive

If the above solutions cannot solve the Windows boot error, the hard drive on your computer may be damaged. So, in this situation, you need to replace a hard drive. But before going ahead, you need to recover the data on the corrupted hard drive first.

After recovering the files on the hard drive, you can prepare a new hard drive and install it on your computer. Then install Windows 10 on it. If the computer is under warranty, you are able to send the defective hard drive to the manufacturer and replace it.

After that, you are able to fix the issue of the default boot device missing or boot failed. From the above part, you can learn that you may come across some Windows startup error unexpectedly. Thus, your computer may fail to boot and you are also able to suffer data loss. So, keeping a habit of file backup is pretty important. Hence, to back up files, you can use the professional PC backup software – MiniTool ShadowMaker.

It allows you to back up files, folders, disks, partitions and the operating system. When your computer fails to boot or the data is lost, you can restore files with the backup images created before.

Bottom Line

To sum up, this post has shown 4 reliable ways to fix the error of default boot device missing or boot failed. If you come across the same error, try these solutions. Hope this post is helpful.

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