Today, while running Window 7 via bootcamp I noticed that the top back side of my iMac was VERY hot to the touch. I wasn't playing a game or anything, just downloading something via Steam. I then went to restart to OS X and when the OS came up my background desktop was all pixilated (included screenshot). The icons looked fine, but I've never seen this happen before. The computer is less than a year old. Should I start thinking about taking it in to an Apple Store?