I just bought a G4 Digital Audio (was supposed to be a Quicksilver, but this is just as fine). I hooked it up and turned it on and everything works fine, but I noticed when looking at the back that it was rather hot around the power supply and then noticed that the fan wasn't spinning. So here's my question, should I replace the power supply (and if so, what kind should I get?) or should I try and get a full refund from the guy who sold it to me? I don't know if an overheating power supply could have caused any damage to the rest of the system.