Apple has released an update called the 27-inch iMac Firmware Update 1.0, which addresses the odd flickering issue that has been plaguing the high-end 27-inch iMacs.
About 27-inch iMac Graphics Firmware Update 1.0
Updates the graphics firmware on ATI Radeon HD 4670 and 4850 graphics cards to address issues that may cause image corruption or display flickering.
The update is a whopping 683KB in size, and requires Mac OS X 10.6.2 to be installed. You can find the instillation instructions here.
As you may remember, the iMac has had several issues since their launch in late October, such as being delivered with faulty screens, issues with Flash performance, and most recently, the screen flickering issues. With this issue addressed, it appears these machines have no remaining problems.
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