Hello. My friend gave me his old mac, its a june 2004 dual g5 powermac 2.5ghz, liquid cooled... Im not exactly sure what was wrong w it, i plugged it in and i could see a spark up behind the power button on the front of the case, so i replaced the power supply, there is no more sparking! But, when i plug it in, the power button light blinks on once for about a second. Then it shuts off and cant get it to do anything. I tried replacing the cr2 battery on motherboard, tried resetting the pmu, still no love... Anybody ever replace their june 2004 dual 2.5 liquid cooled powermac g5 or anyone have any idea? Thank you so much for your help, it would be great to have this running again.