I recently got the Core i5 iMac and I seem to have a problem which I cannot see discussed here. I might be only one out there :-S. Basically, while I'm working doing everyday things like browsing, coding, iMovie etc...my screen just freezes and there are squares of white noise pixels scattered everywhere. I can see the mouse cursor as I move but the image is so distorted that I dont know what Im clicking. Restarting the machine fixes the problem. I made a youtube video so you guys could see what I'm talking about here: http://www.youtube.com/watch?v=sVHCn9VSyIA If anyone has any idea what's going on here, please don't hesitate to suggest possible solutions. I have already ordered and received the Core i7 iMac and will be sending this one back but I want to see this problem resolved for anyone else who is having this problem.