Must boot into BIOS to select Windows Boot Manager manually

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  1. GuyInDogSuit
    Posts : 341
    Windows 10 Pro x64
       New #1

    Must boot into BIOS to select Windows Boot Manager manually


    A few weeks ago, my PC started acting odd. It would boot, show the post screen, then give me an error about an operating system not being found and advising me to unplug any drives that don't have an OS on them. Well, I tried that, and it still does it. So I found that I have to press Delete to enter the BIOS, access the boot menu, and manually select Windows Boot Manager on my SSD. Is the bootloader corrupted or something? How do I fix this? I remember you could use a somewhat non-user-friendly software application to fix it in older versions of Windows, but I don't think it works anymore for 10. Or does it? Any ideas?
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  3. NavyLCDR
    Posts : 18,430
    Windows 11 Pro
       New #2

    We need to see a screenshot of disk management:
    Disk Management - How to Post a Screenshot of | Windows 10 Tutorials

    Please be sure to follow the instructions to widen the columns so we can see all the data.
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  4. GuyInDogSuit
    Posts : 341
    Windows 10 Pro x64
    Thread Starter
       New #3

    Disk 0 partition 2 doesn't have a file system and is 100% free. I'm not sure that's right.
    Attached Thumbnails Attached Thumbnails Must boot into BIOS to select Windows Boot Manager manually-diskman.png  
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  6. Samuria
    Posts : 8,100
    windows 10
       New #4

    The second parition the uefi boot parition aand only contains a boot file so it may show as 100% free. Have you run a disk check ?
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  7. GuyInDogSuit
    Posts : 341
    Windows 10 Pro x64
    Thread Starter
       New #5

    Samuria said:
    The second parition the uefi boot parition aand only contains a boot file so it may show as 100% free. Have you run a disk check ?
    No errors found.
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  8. GuyInDogSuit
    Posts : 341
    Windows 10 Pro x64
    Thread Starter
       New #6

    This is what I see if I don't boot into the BIOS to select the drive:

    Must boot into BIOS to select Windows Boot Manager manually-20181108_144259.jpg
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  9. GuyInDogSuit
    Posts : 341
    Windows 10 Pro x64
    Thread Starter
       New #7

    Any ideas?
    I tried this fix on an Microsoft article, but it didn't work.
    Last edited by GuyInDogSuit; 13 Nov 2018 at 22:39.
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  10. NavyLCDR
    Posts : 18,430
    Windows 11 Pro
       New #8

    Check the boot order in your UEFI settings and make sure it is Disk 0 that is the first in the list.
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  12. GuyInDogSuit
    Posts : 341
    Windows 10 Pro x64
    Thread Starter
       New #9

    The oddest thing happened before I went to work. After I tried that fix, I rebooted and entered the BIOS to boot Windows. It gave me that error again. I rebooted, and did nothing this time, and Windows booted. Just now, I booted again, did the usual BIOS thing, and it gave me the error. I checked the drive boot order like you suggested, and everything was correct. I rebooted, and Windows started up. Very odd. The thing is, this error has happened before, then somehow "remedied" itself. Then a few weeks later, it started giving me the error again. So I'm stumped on this.
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  13. cereberus
    Posts : 15,480
    Windows10
       New #10

    GuyInDogSuit said:
    The oddest thing happened before I went to work. After I tried that fix, I rebooted and entered the BIOS to boot Windows. It gave me that error again. I rebooted, and did nothing this time, and Windows booted. Just now, I booted again, did the usual BIOS thing, and it gave me the error. I checked the drive boot order like you suggested, and everything was correct. I rebooted, and Windows started up. Very odd. The thing is, this error has happened before, then somehow "remedied" itself. Then a few weeks later, it started giving me the error again. So I'm stumped on this.

    This will sort it.

    https://www.tenforums.com/tutorials/85198-use-macrium-reflect-rescue-media-fix-windows-boot-issues.html
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