Some may remember about 4 weeks ago I had a constant rebooting problem with my iMac G5 (rev b IIRC, it was the G5 just before the adding of the iSight). After some frustration of two visits to drop the iMac off for repair (stupid me for expecting that showing up before the doors opened would allow me not to wait till 8PM for the first Genus appointment for that day. ). So after my second visit a day later, the next day my iMac was repaired. They replaced the power supply. All was well till this week when the same problem showed up again. Now they are replacing the logic board. I am concerned, despite assurances, that there could be no problems with the second power supply. Is this possible, or could I be facing yet a third visit weeks down the road?