Hi
Have you tried this method to fix this problem?
For issue were you are getting black screen with white cursor
Press Ctrl+Alt+Del
Go to 'Services' tab
Look for 'AppReadiness'
Right click and stop it.
Make sure you disable the same after login into Windows.
Click start and type 'Services'
Look for 'AppReadiness'
Right click and select 'Properties'
Startup type should be set to 'Disabled'
Set the 'Service Status' to Stopped.
Here is a link who has the similar problem which we could refer to .
https://answers.microsoft.com/en-us/windows/forum/windows_10-performance/black-screen-with-cursor-after-windows-10-update/8d470d56-275d-447c-a5f8-e29edf6a6df7?page=8
Best Regards
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