My friend has a pc, that wasn't cleaned in a loooongtime, so we took it a part and cleaned it out properly and stuff, i checked to see if there was any corrosion on the board due to the dust and moisture and i found none. After putting the system back together, i turned it on,it booted up fine and all, so i turned it off to add in the other hard drives, after adding the hard drives i tried to turn on the computer, but it would not turn on any at all (the motherboard has NO standby light), i jump started the psu after fully disconnecting everything and it worked fine, i hooked up a fan to it and it worked also, connecting it to the board i tried turning it on again but it still wouldn't turn on. I pull everything out of the case and hooked it up, it turned on again. so i turned it off after awhile, then placed everything bk in the case, this time it didn't turn on, so i checked the wires and all still no boot. I moved around the wires and let left it for a bit and tried turning it on again, this time it came on. i turned it off again and now it won't cum on again. any ideas what maybe wrong? I am thinking the power supply maybe bad.