Windows Server 2016 BSOD 21a stop code

Question

I am getting the 21a stop code error on a Windoes Server 2016 standard. Started this morning and ideas...

I have done Automatic repair and it did not work. Did chkdsk and no issues found?
Then I did the following:

BootRec.exe /fixmbr
Bootrec.exe/fixboot
Bootrec.exe/RebuildBcd

Then restarted still no luck. I also looked at the volumes in dispart and it said C: had 0 space, 100GB allocated. Any ideas?

Answer 1

Hi

There are several methods for us which could try to solve the problem.

Method 1:Boot Windows Without the Driver Signature Enforcement Feature
To commence the process, restart your PC and keep tapping F8. And if that doesn't work, then use F11 to open the windows menu.
Your computer should boot in the Recovery options menu. Select "Troubleshoot">" Advanced Options">" Startup Settings">" Restart".
Hold F7 to reboot your system, this will start your system with Disable Driver Signature Enforcement disabled and check if the problem is fixed.

Method 2:Uninstall Recently Installed Software/Hardware
If you install any hardware or software before encountering the stop code 0xc000021a error, then you consider uninstalling them to resolve the error. It could be possible that recently installed hardware or software is incompatible with your operating system.

Method 3:Run DISM Command
You can also try running the DISM command. Just like the SFC scan, a DISM scan helps you resolve the error.
"DISM /Online /Cleanup-Image /RestoreHealth" and hit Enter.

Also , there are many other methods we could use to try.Here is a link with the video to fix error 21a which we could refer to.
https://www.techinpost.com/how-fix-solve-error-code-0xc000021a-problem/

Best Regards

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