I went to wake my iMac G5 this morning, and soon after hitting the space bar it rebooted. The screen went gray, the apple came up, the process disk started spinning just as usual. Then when the screen was turning to my blue desktop I heard a slight *pop* or *click* sound and it robooted again. Then the process repeats itself - over and over. It happens at exactly the same place every time - it gets to the part where the desktop is about to come up (the blue starts to draw from the top, and gets about 3/4 of the way down the screen), and then *click* reboot. I've tried starting in safe mode, and starting from the Tiger install disk. In both cases the same results. Any thoughts? Is my computer fried?