Windows 10, restored on virtual disk, flickering at login screen, cann

after some trials to restore my Windows 10 installation to vhdx and boot into it, I always end up with Windows booting but hanging at the login screen, not allowing me to login normally.
I can boot into safe mode, where i tried:
- disabling all startup
- disabling all services
- even deinstalling nvidia graphics drivers
But always, the issue remains, the logon screen gets shown, flickering, that's it.

any help appreciated!
https://vimeo.com/192700706

no answer to this?

having connected the virtual disk at the same time with the original, identical disk, might that be a problem?
Some unique disk id needing to changed?
should this question be moved to the Virtualization forum?