I try to play CS and about 5 minuts in my speakers make an odd little humming noise and the system shuts off. Probably something overheating, but I don't know what. I can only afford to cool one thing down right now. My cpu temp seems sort of high, but not dangerously. So I think it may be that. I want to get this thermalright heatsink and a decent little fan for it, but agh... the shipping time.

Anyway... would anything other than the CPU be the cause of these unwanted shutdowns?