i'm going to say the PSU too, modern athlon and intel motherboards / cpu's need at least 250 to 300 watts to run properly, and then you have to be able to power your drives, your pci cards, your agp video card (if yours is agp), etc.... if you only have a 250 watt psu, you're really stretching for power, the motherboard and cpu are using most of it and not leaving enough at all for the rest of the system...
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