hey everyone - haven't been on in a while. I am staying at my grandparents, and I have about 7 or 8 Powermac G4 mirror drive computers. All of them have the same problem - their startup. so I plugged them in. Most of them powered on fine, but one didnt. It would start up, and within about 5 minutes of use, it would fall asleep. I was using it the whole time, so it wasnt on a timer or anything. I hit the power button to start it back up, and it came back on. after about 30 seconds, It would fall asleep again. I would power it up AGAIN, but it still shut off after 30 seconds. Any ideas? Now for the main problem. Most of the computers start up fine and can be used normally. But once you shut them down, they cant be powered back on. I have found that the only way to do this is to unplug the power cord from the back of the computer. Then plug it back in and hit the power button. It comes right back on and is ready to use. Any ideas? Thanks for you help.