Apple has just released the 27-inch iMac Graphics Firmware Update 1.0, an update for the graphics card on 27-inch iMacs.
The update fixes problems that could cause corruption of images and flickering the display of machines with ATI Radeon HD 4670 and 4850 chipsets. The failure had been reported a few days ago by .
The new firmware weighs only 683KB and is compatible with Mac OS X 10.6.2 or higher. More details on the problem can be found in this Apple support article.
