i was given a power mac G5 DP (2GHZ) it has 8GB RAM (factory, i guess ... it is on the sticker) and no HDDs (donating party wanted them back, i kept the screws for mounting). my problem is that i won't power on. all it does is make that clicking breaker switch type noise and flash the power light and turn off. the fans move slightly during that 1 second that it is on before turning right off. i tried to reset the PMU by pressing the button under the front fans with the unit unplugged. i also tried removing the battery from the logic board and discharging the board by holding the power button for 15 seconds(with battery out and power unplugged). could anyone please help me with this? i would love to get this working for my family to have a common computer to use when ever they like instead of borrowing my macbookpro. thank you for any help.