Here's a " fun" one, from yesterday morning.
Left my desktop to do Windows 10 updates overnight, got up. still in progress. Hung. Splash screen only.
After many hoops, finally get into "safe" mode so I can actually deal with it. System file checker, chkdsk, all ok. No change.
Lots of time watching the splash screen, between bouts with Safe mode. Making new restore points whenever it seemed to be functional. just in case.
Ran Mickey's "Windows Update Fix", and it all came back.
So, if one is stuck in a bad update scenario, might be something to consider.