Apple has released a firmware update for its iMac line to address some iMacs freezing up:
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About iMac Graphic FW Update 3.0
This firmware update fixes a graphics issue that may cause an iMac to hang under certain conditions.
Do not shut off the power on your iMac during this update. Loss of power could result in your iMac failing to start up.
This update can be gotten via software update or by going here.
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