Got my iMac on Friday, and today when I came into work there are a lot of crazy artifacts on the screen 
after calling apple care they have diagnosed a hardware fault (obvious I know but they have to go through the whole process) and i'm down for a replacement...
anyone else had hardware problems like this? i opted for the 4850 model maybe thats where the problem lies?

after calling apple care they have diagnosed a hardware fault (obvious I know but they have to go through the whole process) and i'm down for a replacement...
anyone else had hardware problems like this? i opted for the 4850 model maybe thats where the problem lies?