Some users are saying that Apple's new aluminum iMac is freezing, making it useless until a reboot. The issue appears to be related to the ATI Radeon HD graphics hardware and its drivers, but has proven somewhat incorrect. While some customers have said they can cause the freeze by running games, iTunes, or other programs that push the video chipset, others have had the lockups occur at seemingly random times or after running the iMac for long intervals of time. Apple is aware of the issue, but hasn't yet responded with a permanent fix. Both the 1.0 and 1.1 iMac Software Update packages released since the iMac's August launch have been for important bug fixes, both of which were centered around video drivers, but none of these included a fix for the freezing issue.
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