Apple made a new update available today for the 27″ iMacs. Hopefully this will solve the whole screen flickering issue. It’s a firmware update to the ATI HD graphic cards. Updates the graphics firmware on ATI Radeon HD 4670 and 4850 graphics cards to address issues that may cause image corruption or display flickering. I [...]
UPDATE 2: Apple came out and replaced the LCD screen and the vertical sync cable. After two hours, the problem re-appeared. Apple is now going to replace the whole iMac. UPDATE: On the fifth day now and the iMac running XP is starting to flicker. I was wrong in believing this was a software issue. [...]