Hello all, I have an Octo intel core Mac Pro purchased in Dec 2007. It has been running fine no problems until yesterday. It will reboot while in the midst of working and get stuck in a loop from the reboot. The Mac sounds like a broken record on reboot, skipping over and over at the internal chime boot music. It will after several attempts reboot, only to reboot anywhere from several minutes to a few seconds. I've unplugged and rebooted no fix. I had a WD 1 terabyte HD External that I removed, still not the problem, although I do notice it happening (crash reboot) when access any drive including Mac main HD. But, it has also happend when I am not in the room. There does not seem to be a pattern to the reboots. Is/has anyone experienced this? Any ideas as to the cause. FYI, I was using Final Cut Pro 6 the first time it happened, but will happen now without it running. Thanks in advance. Will P.S I have Boot camp installed and tried booting into Windows..after several failed attemps at getting to the multiboot OS start screen after auto reboots, I managed to get there. Only to have the reboots happen there as well. So it sounds more like hardware than software?! Is it possible for the system to overheat and reboot? Its not impossibly hot, but we have had record temps here in LA, aroun 101 degrees and the house was about 90?! Just a thought.