Glad this helped. I'm still working w my band aid solution, which is disabling anything happening when cover is closed, and either manually putting laptop to sleep or shutting down when not in use.

I have an old compaq that was supposed to be compatible with upgrade, but it's not. This is as advanced a fix I have established since experiencing this upon upgrade to Windows 10 from 7 earlier...

Tried that too, don't have PC in front of me but think it's Fn+F4. Can try again, may be mis reading the correct icon on F-key.

I tried to switch between devices like I normally would, Windows+P, but it doesn't work. On external screen when I get to the choice for external screen, both remain black. The external monitor...

same problem as original post...a few observations. This happens when I close the lid and the laptop goes into sleep mode.

Updating BIOS didn't solve my problem.
Trying to revert back to...