I just recently bought a G5 Power-mac for a dollar, and nothing works. It powers up, and then the fans continually ramp up. I have tries moving the RAM around according to the (online) manual, and its all identical so I just left it the way it was, just inverted. The graphics card is the 6800 Ultra AFAIK, the serial check websites are saying its 2 different Radeons, but it isn't. With the GPU out, the fans don't go jetspeed ahead, but there still isnt a chime. The PSU makes a tiny shock noise, barely audible, when I plug or unplug it.