Bootmgr is missing

  1. bjproc's Avatar
    Posts : 100
    Win 10 Pro
       #1

    Bootmgr is missing


    I had my pc running last month, then when I was on my laptop it started crashing, turned out it was due to an update from malware bytes
    I eventually went to my main PC and all I get now is bootmgr is missing and all I get now is a black screen

    I've tried putting in a pen drive with win 10 on it to do a start up repair, system restore etc, but nothing is working
      My Computer

  2. Samuria's Avatar
    Posts : 6,558
    windows 10
       #2

    When you boot the usb what happens how far do you get any error message
      My Computer

  3. bjproc's Avatar
    Posts : 100
    Win 10 Pro
    Thread Starter
       #3

    i can get to the options to install windows, or repair this PC, i can get onto the advanced options, then start up repair searches then doesn't work, there's no options for system restore etc
      My Computer


  4. Posts : 39,169
    windows 10 professional version 1607 build 14393.969 64 bit
       #4

    Open safe mode with command prompt:
    Boot into Safe Mode on Windows 10 Windows 10 Tutorials

    Hardware method to boot to the Windows advanced troubleshooting menu:
    Power on > power off when you see the windows icon
    Repeat power on > power off when you see the Windows icon.
    Power on the third time and see if will open the computer's windows advanced troubleshooting menu.

    If you cannot open the computer's windows advanced troubleshooting menu then you usually can open the windows advanced troubleshoooting menu on a bootable windows 10 iso:
    Download Windows 10

    For a custom desktop > temporarily change the BIOS boot order so that the external USB hard drive is on top.
    Boot to the Windows 10 iso.
    It may take 5 - 10 minutes for the iso to load while viewing the Windows icon
    Select language, time, currency, and keyboard, or click next
    Click troubleshoot
    Start with startup repair. If startup repair fails move to the next step.
    Click system restore > start with the oldest restore point and keep repeating until all restore points are used. If system restore fails or if there are no restore points move to the next step.

    For these steps use a camera or smart phone camera to take pictures and post images into the thread.
    Additional commands will be based on the results of these commands.

    1) Open command prompt > administrator X:\windows\system32\cmd.exe > X:\Sources> type:
    2) c:
    3) dir
    4) d:
    5) dir
    6) x:
    7) bcdedit /enum
    8) bcdedit | find "osdevice"
    9) diskpart
    10) list disk
    11) list volume
    12) select disk 0
    13) list partition
    14) select disk 1
    15) list partition
    16) exit
    17) bootrec /fixmbr
    18) bootrec /fixboot
    19) bootrec /scanos
    20) bootrec /rebuildbcd
    21) chkdsk /r C:
    reboot
      My Computer

  5. spunk's Avatar
    Posts : 3,405
    Windows 11 Pro 64 Bit 21H2
       #5

    I had my pc running last month, then when I was on my laptop it started crashing......I eventually went to my main PC
    So, which computer is not booting? The Laptop or the Desktop?
    With the Windows installer Flash drive in, boot into Setup (Bios) go to the Security tab. If Secure Boot is enabled, Disable it or change it to Setup mode. If you see UEFI Bios, change it or add Legacy Boot. Your USB Flash drive should now show as a Legacy device. Move this to First Boot Device. Save and Exit.
    Boot off the flash drive and follow the instructions in Post #4
      My Computer

  6. bjproc's Avatar
    Posts : 100
    Win 10 Pro
    Thread Starter
       #6

    it's my main desktop PC that won't boot up.
    from the bootable flash drive, i can get into the windows advanced troubleshooting menu, but nothing is working from there on, i can get command prompt to work

    Bootmgr is missing-options.jpg
    it's an SSD if it makes any difference

    I'll print off the replies & try the suggestions

    cheers
      My Computer


  7. spunk's Avatar
    Posts : 3,405
    Windows 11 Pro 64 Bit 21H2
       #7

    OK if you are at the Advanced Options and Startup Repair, System Restore, and Command Prompt using the Commands in post #4 don't work, then choose Go Back to Previous Build
    If all else fails, be prepared to reinstall Windows.
      My Computer

  8. bjproc's Avatar
    Posts : 100
    Win 10 Pro
    Thread Starter
       #8

    spunk said:
    OK if you are at the Advanced Options and Startup Repair, System Restore, and Command Prompt using the Commands in post #4 don't work, then choose Go Back to Previous Build
    If all else fails, be prepared to reinstall Windows.
    sounds like it, as nothing is letting me go back.
    Still to do all the CMDs
    No previous builds to go back to either.

    I'm wondering if the SSD has failed?

    If it's a reinstall, i'll go back to an HHD
      My Computer

  9. bjproc's Avatar
    Posts : 100
    Win 10 Pro
    Thread Starter
       #9

    Don't see a solved option on my phone?
      My Computer


  10. Posts : 39,169
    windows 10 professional version 1607 build 14393.969 64 bit
       #10

    Please use a camera or smart phone camera to post images into the thread for the commands in post #4.

    Separate the steps into groups and see if any of these commands work:

    1) c:
    2) dir
    3) d:
    4) dir
    5) x:

    1) bcdedit /enum
    2) bcdedit | find "osdevice"

    1) diskpart
    2) list disk
    3) list volume
    4) select disk 0
    5) list partition
    6) select disk 1
    7) list partition
    8) exit


    1) bootrec /fixmbr
    2) bootrec /fixboot
    3) bootrec /scanos
    4) bootrec /rebuildbcd

    1) chkdsk /r C:
    reboot

    1) bootrec /rebuildbcd


      My Computer


 

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