It died on me a couple times while running (a proper image of) ASD 2.5.8... i guess there's something wacky going on either with the cooling or power supply or both.

thanks for the advice though everyone - i'm going to try and see if i can bring this back to life... different model G5's didnt use different power supplies, did they? like if i have a good one in a different G5 that's older (all the ones i have are PCI-X)?