Currently Being ModeratedJun 11, 2012 8:35 PM (in response to usctrojan)
Me too. It seems to happen when I switch between integrated and dedicated graphics.
The problem seems to be solved here http://support.apple.com/kb/TS4088 but I've done the necessary steps to no avail. It definitely seems to be a hardware problem as even a new fresh install doesn't help rectify the situation.