I can't say I have ever seen a black screen after an update.
Ctrl alt del and open explorer using task manager could help too. sometimes restarting explorer can show desktop - this works better if you can see cursor.
If you load to a blank desktop it can also mean hardware isn't responding to drivers... it doesn't necessarily have to be GPU drivers. It can be anything. I have had it caused by my speakers not answering at startup and making everything wait until it timed out.
restarting in safe mode could help.