So the other night, while I was off in the kitchen getting dinner, my venerable power mac G5 desktop ...stopped. I came back, the monitors were in sleep so I moved the mouse, pressed space..nothing...so I concidered it might have crashed or something..held in the power to shut it down if on (I can't recall if fans were on or if i noticed). then went to press power and nothing happened. (there may have been a crackle sound..maybe not). Left it unplugged overnight, in case, maybe it over heated or something and shut down for that (been very hot), but still nothing. Tried different power cables..just in case, nothing). I've yanked the two drives and tested them, and they're both ok. I have instructions from iFixIt on how to remove the power supply. The problem is...i really don't know how to diagnose the problem beyond this. Any advice? (within the month, I'll be getting a new iMac, so things aren't critical, but if i can figure out the problem and fix it for cheap, I'd prefer that to just junking it).