Usually towards the end of the night (around 8-10pm) after having my computer on since sometime in the afternoon (usually between 12 and 3 pm) my computer screen flashes off and on. It will turn off for about 2 seconds, then come back on. Then a few minutes later it will do the exact same thing. I restart and it and it is fine for a few minutes, then it will flash again. The tower also makes weird noises, like ... the noise is like a car revving. It will 'rev' up, then go silent, then it will rev up again, then go silent again. It only happens at the end of the night, when I'm almost done using the computer for the night, and when I turn it on in the morning/afternoon it works ok, but still with the key repitition and the time issue.
Anyone have any idea's what is going on?