Latest Win11 update KB5046633 caused my black screen on a Lenovo ideapad3.
Uninstalling the update fixed the problem.
Then re-ran windows update... black screen again.
Moral of story... Don't install KB5046633!
I had the same problems as others here, black screen on Win11 presumably after an update.
After trying all the methods described with no results, this one finally worked.
I manually uninstalled the KB5046633 update using "wusa.exe /uninstall /kb:5046633" from the prompt and after a reboot the desktop reappeared. Thanks for the advice!