I had an incident earlier today with my laptop. The screen went dark and stayed that way. Nothing would bring it back to life, not CTRL-ALT-DEL, not closing and opening the screen/cover, nothing!! Furthermore, I couldn't shut it down either. It just sat there with three LEDs glowing at me with utter disregard for anything I could think of to do. (Sometimes these things do seem to exhibit free will, don't they.)
I'm not sure what brought the problem about. I had been running an anti-virus scan during which I had closed the case which was something I'd done many times before. When I went to look at the scan's results, that was when I discovered the problem.
I decided to let the laptop run down its battery by disconnecting the power cord and leaving the laptop alone for several hours. When the battery finally gasped its last, the laptop finally shut down.
I reattached the power cord and left it attached for an hour or so. Then I started up the laptop and got a screen display. It said that the computer had not shut down properly and asked if I wanted to start things in safe mode or start normally. I chose to start normally.
The laptop booted itself, asked for my password, accepted the password and came to life as usual but with a screen message that an Adobe update to Flash was needed.
I don't know if maybe the Adobe update message came along during the anti-virus scan and the two of them had an argument. Perhaps someone can tell me about that.
In any case, I did the Adobe update and the now laptop appears to be fully restored to service.