Error 21 during startup?

Discussion in 'Computer Hardware' started by Joeyfuller2000, Aug 21, 2018.

  1. Joeyfuller2000

    Joeyfuller2000
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    Jan 19, 2015
    Messages:
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    I get this error when I turn on my Dell desktop. This has never happened to me before, and I have tried several things, and none of them worked.
    Some of these include:
    Swapping the drive in different computers to see if it boots. Same problem
    Disconnecting then reconnecting the cables while the system is off.
    Booting through USB adapter cables
    Running the startup repair option in the Windows installation disc.
    Chkdsk

    I know the drive hasn't failed yet because I can still access my files through the USB adapter on another computer. I think it's a problem with the Windows installation.
    The last time it successfully booted I had to install some updates. Could these be the source of the problem?
    Oh yeah, I should mention, I tried Googling my problem, to no avail.
    Specs:
    PC:
    Dell Optiplex 7010
    Intel Core i7 3770k @ 3.5 GHz
    Nvidia Geforce 740 4GB SC
    Samsung 850 EVO SSD GB (the OS is on this drive)
    16GB DDR3
    IMAG20481.jpg
     
  2. fufsgfen

    fufsgfen
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    Jan 10, 2017
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    6,782
    Maybe run Malwarebytes scan on that drive?

    Could be because of updates, does it start even in fail safe mode? Uninstalling updates might be bit involving if you can't get OS to run at all.

    Then again most results seem to involve some kind of Phishing software disguised as repair tool, which kinda hints root of problem might be of sinister origin, hard to tell.

    Might be easiest to backup files and do fresh install with installation disk.
     
  3. Joeyfuller2000

    Joeyfuller2000
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    I did a malwarebytes scan yesterday before I installed any updates. Unfortunately I can't even get into safe mode, it just brings up that error.
    I am going to try a malwarebytes scan again through a USB cable on another computer. If that doesn't fix it, then I will just do a reinstall.
     
  4. Mr.Blueboy

    Mr.Blueboy
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    153
  5. Joeyfuller2000

    Joeyfuller2000
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    So the solution to this is actually to repair the MBR of the windows installation. I had this appear on a Dell latitude d430 and the solution was to run the following commands:
    bootrec /FixMbr
    bootrec /FixBoot
    bootrec /ScanOs
    bootrec /RebuildBcd

    I did the same thing with my desktop ssd and it works fine now
     
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