If you're running Mac OS X 10.6.7 on a 2011 iMac, you may have noticed some graphics glitches going on. Don't worry, Apple took notice too and released a small firmware update to help out!
Some of the issues that would arise from the glitch would be a white screen during startup, which could cause your Mac to go unresponsive, or vertical lines would show up on the screen while in use. According to the release notes:
This firmware update fixes an issue that in rare cases may cause an iMac to hang during startup or waking from sleep. Do not shut off the power on your iMac during this update. Loss of power could result in your iMac failing to start up.
You can get the standalone iMac Graphic FW Update 2.0 (700KB size) if you've been experiencing some of the above issues on your mid-2011 iMac, or check out Software Update from the Apple menu and then following the onscreen instructions from there.
via 9 to 5 Mac
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