27-inch iMac Graphics Firmware Update Update the graphics firmware on your iMac
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27-inch iMac Graphics Firmware Update Description

Update the graphics firmware on your iMac The 27-inch iMac Graphics Firmware Update applies to the graphics firmware on ATI Radeon HD 4670 and 4850 graphics cards and addresses issues that may cause image corruption or the display to flicker.Additional InformationTo determine if the update has already been applied to your computer, follow these steps:1. From the Apple (?) menu in the upper left menu bar, choose About this Mac. 2. Click More Info.3. In the hardware section, click Graphics/Displays.4. Locate the ROM Revision field. You should see revision 113-B9110C-425 or 113-B8030F-260 if the update has been successfully applied.WARNING: Do not disturb or shut off the power on your iMac during this update. Loss of power could result in your iMac failing to start up.

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