Hello everyone, I have a very annoyed problem that even I brought my iMAc to the Genius Bar 2 times, they cannot identify the problem is. It happened (well more regularly) when I play WoW and SC2 on both Mac OSX (10.6.8) and WIndows 7 bootcamp, the comp just suddenly auto restart itself. I have updated latest driver on both operating systems, check out all the discussion to unplug all USB, plug directly to power point, reset Vram (or watever it is), format, reinstall the OSX and windows... The problem is still exist... The first time I brought to iMac store, they change a new motherboard because they believe there is problem with transistor. Then the problem was still exist, then I brought second time. This time they said they cannot identify what is the issue is after running all complicated test... and asked me to bring back home to check it out again. Once I turn the machine on and play the game, the comp restart immediately on the character selection... This is the first time I buy the iMac and it turns out really disappointed. Would you guys please point out any solution for my problem? whether I can play on OSX or Windows... My iMac is 27" intel core i3, graphic card ATI 5670 Thanks heaps!!