bingle

I'm having a weird problem right now where my video will essentially shut off - my monitor just loses the signal and there's no recovery, short of a reboot. I'm not sure what's causing it; my only guess is that it might be power-related? It seems to happen during CPU- and hard-drive-intensive tasks, like video encoding, but not during things like 3D games. It also only began happening a little while ago, so it's possible it's a software issue, but I'm not sure what software could do that.

Here are my specs:
300-watt power supply
Radeon 9800 Pro
Athlon XP 2600+ (1.9 GHz)
DVD burner
2 80-gig hard drives (7200rpm)

My system hardly ever gets above 40C, so I don't think it's heat-related... I've also tried the most recent Catalyst drivers and they didn't seem to help.

Any ideas would be appreciated, this is starting to get annoying :-(

Bingle