I've had the same problem twice now. The first time I was watching a movie on media player, when the screen went black. At first I thought the screen had shut off because I wasn't doing anything on the comp, but when I moved the mouse to start up the sceen, it didn't turn on and the sound from the movie was still playing. I had to shut off the comp by holding down the power button.
The second time it happened again when I was watching a movie, the sound was still play but the screen was black. I tried againg to move the mouse, I tried opeing the task manager and just typing when after about a minute the screen came on again, but it looked like I was in safe mode. Then an error popped up and said a driver (name started with an "i" and ended with "5") wasn't responding and I had to save my work and shut off the comp. Anyone knows whats going on? I've never had this problem in the 4 years I've owned a computer so any help would be great.

Cogito Ergo Sum (I think therefore I am)