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 iMac Graphics Firmware Update will update the graphics firmware on your iMac.
Do not disturb or shut off the ability on

your iMac during that update. Loss of potential could outcome in your iMac failing to start up.
For detailed knowledge on that update, please visit that website: http://support.apple.com/kb/TS3181

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