Windows 10: BSOD (error 0xc000021a) leading to Black screen with blinking cursor

Lenovo T450s was experiencing BSOD error 0xc000021a on an infinite loop so was not able to access desktop at all. After desperately searching online, I found a solution where I ran the following in the command line when Windows Repair pops up:

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd


Afterwards, the laptop does not boot up properly and is stuck on a black screen with a blinking underscore. Need help fixing the black screen, if possible. And advice with the BSOD loop. Cannot wipe and install new OS because files are not backed up, and HDD is encrypted which prevents me from extracting the files.


Things I tried to fix the black screen:

CMOS reset

Switched boot to UEFI Only

Switched the boot order so the HDD is first

Reset CMOS

Turning it off and on many times

Kept it on to see if it would boot properly

:)

 

Black screen with blinking cursor

I run Windows 10 and have a black screen with a blinking cursor in the upper left corner. I can hit Control, Alt, Delete, and it reboots momentarily, show the Dell logo and F2 Setup anf F12 Boot Options in the lower right corner. Regardless of what key
I hit, it goes right back to the Black screen w/ cursor. I can't seem to do anything. Any suggestions?

 

Black screen with blinking cursor

Hello,

This issue regarding the black screen and blinking cursor maybe due to incompatible, outdated or corrupted device drivers. There are certain steps that we can do to troubleshoot this issue. Let's follow the methods provided by Aadland on August 8, 2015 on this

link and see if this will resolve your concern.

Get back to us if you need further assistance.

 

Multiple bsod errors and black screen with cursor on start up


I know it says to install and run the program in the sticky but i can't get into windows

PC has been running fine until recently. I have been getting occasional random BSOD errors over the last few days which I didn't think much about, but today I started getting a lot of them, occurring a few minutes after boot. After a few restarts I then started getting a black screen with cursor when the login screen should appear. The jingle still sounds. Some of the BSOD errors I wrote down.

Bad pool header
PFN corrupt
Memory management
0xc000021a

The black screen will not respond to CTRL ALT DEL etc. I tried following steps on some posts to enter password blind by pressing space /ctrl but this does not work for me. The screen stays on indefinitely.

I have also tried chkdsk on C drive. No errors. I tried system restore, but it says I have no checkpoints. I thought I did have it switched on but I guess not.
I tried start up repair but it says it cannot fix the problem. I don't have a system image either (I know, I'm a fool). I tried safe mode and low res mode. Same black screen just with a larger cursor.

Apart from reinstalling windows again, i can't think of any other things to try.

Any help would be appreciated.