iMac 27″ screen flicker
Yesss! Apple released the 27-inch iMac Graphics Firmware update, which solves the screen flicker problem. The update applies to the graphics firmware on ATI Radeon HD 4670 and 4850 graphics cards to address issues that may cause image corruption.
It worked great for my iMac, but use it on your own risk: Link
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27", 27-inch, flicker, iMac, iMac 27 screen flicker, image corruption, screen flicker
