Sacred Haven of Debauchery

Okay, guys. My monitor goes into power-saving mode, why is that? I'm just sitting here, doing something, and suddenly it dims, I touch the mouse and it turns back on. I don't know what's wrong. Added 16 minutes later. Oh yeah, by the way, I passed the exam, which I'm very happy about, because many didn't pass and now they will be retaking it in the fall. Added 1 hour 42 minutes later. Damn, now it's restarting too... =[ So, I have a few theories: 1. The computer is overheating. 2. The video card is dying, so there are glitches... because I also have multicolored dots appearing on the screen, and 3D games are glitching (graphics), and also flowers and some statuses in Heroes don't render properly, or rather, not always, as well as the cursor when hovering over Winamp... for example, I hover over the close button, and the arrow disappears. 3. Viruses... but I don't know where they came from, everything seemed fine. Added 30 seconds later. Maybe someone has encountered this and knows