BSOD after a Visual Studio install Reboot Error 21a

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  1. ravneetg
    Posts : 15
    Windows 10 Pro
       New #1

    BSOD after a Visual Studio install Reboot Error 21a


    Hi All,

    Windows 10 Pro here. Installed Visual Studio Community edition 2017, and after a reboot, I cannot get back to the system.
    - System has been trying to Attempt Repairs for more than a day now.
    - Created a bootable USB from another machine and booted into command line
    - chckdsk runs good with no bad sectors
    - bootrec /fixmbr returns success
    - bootrec /fixboot returns Access is Denied
    - bootrec /rebuildbcd returns with 0 windows install
    - bootrec /scanos returns same, 0 windows install
    - Sfc /Scannow /OFFBOOTDIR=G:\ /OFFWINDIR=G:\Windows HANGS. Does NOT even start, cursor blinks
    - G: is the windows drive, I can go in from command line and backup files to my E(Data): Drive. Have not started this yet.

    I will start putting photos of the console shortly if needed.

    Any guidance will be really appreciated.

    Thanks!
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  3. ravneetg
    Posts : 15
    Windows 10 Pro
    Thread Starter
       New #2

    BCDEDIT output

    https://photos.app.goo.gl/QxiJVkpEqAYfmyKf6

    chkdsk g: /r output
    https://photos.app.goo.gl/SrGu9SoNzRG3YvW26
    Last edited by ravneetg; 15 Mar 2019 at 01:48.
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  4. ravneetg
    Posts : 15
    Windows 10 Pro
    Thread Starter
       New #3

    More updates

    - The Registry method cannot be done as the Baks are all 0 bytes. (Wonder why this was not backing up).
    - I tried running the bcdedit and attrib c:\boot\bcd -s -h -r and that sequence after doing the rename does find Windows installation on G:\ but the reboot still failed.

    - Any of the DISM commands do not work. Error from DISM sharing soon.
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  6. axe0
    Posts : 14,903
    Windows 10 Pro
       New #4

    Hi ravneetg,

    Could you fill in the specs of your system please.
    Please follow this tutorial and download the tool. The tool will give you detailed information about your system specs, please fill in your system specs more completely including PSU, cooling and other used stuff like mouse, keyboard, monitor, case, etc.
    The PSU, cooling and other stuff are NOT mentioned in the tool.

    In the left corner below in your post you find 'My System Specs'. After clicking it you can find a link a little below that says 'Update your System Spec', click on this link to get to the page where you can fill in your system specs.

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  7. ravneetg
    Posts : 15
    Windows 10 Pro
    Thread Starter
       New #5

    Hi axe0, i can do that, but can i do that while I am not able to boot? Would the tool launch while I am in recovery environment?
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  8. axe0
    Posts : 14,903
    Windows 10 Pro
       New #6

    Sorry, I posted while on my phone.

    Just enter the specs as best as you can.
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  9. ravneetg
    Posts : 15
    Windows 10 Pro
    Thread Starter
       New #7

    Hi @axe0

    I entered as much as I could pull using the WMIC commands.

    PSU and Graphics I am not sure...its some older Radeon series for graphics card I am sure.
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  10. axe0
    Posts : 14,903
    Windows 10 Pro
       New #8




    Diagnostic Test

     RAM TEST


    Run MemTest86+ to analyse your RAM. MemTest86+ - Test RAM - Windows 10 Forums

    Note   Note


    MemTest86+ needs to be run for at least 8 complete passes for conclusive results. Set it running before you go to bed and leave it overnight. We're looking for zero errors here. Even a single error will indicate RAM failure.


    Make a photo of the result and post it.

    Addition:
    If errors show up you can stop the test, remove all sticks but 1 and test this single stick in each slot for 8 passes or until errors show, switch sticks and repeat.
    If errors show up and you see them a lot later, no problem, the errors don't affect the test.
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  12. ravneetg
    Posts : 15
    Windows 10 Pro
    Thread Starter
       New #9

    Started. Will update results halfway
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  13. ravneetg
    Posts : 15
    Windows 10 Pro
    Thread Starter
       New #10

    Done. No errors. Did 14 Passes.

    https://photos.app.goo.gl/VGM4Vo7zv791aCQz9
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