Apple | Apple 27-inch iMac EFI FW Update 1.0
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Author:
Apple, Inc.
Date: 04/14/2010 10:42 PM Size: 2.1Mb License: Update Requires: OS X 10.6 Downloaded: 2680 times 
TIP:
MacKeeper app delivers a secure and private internet experience, while helping your Mac run like new.
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This update addresses the following:
Resolves an issue that sometimes caused high processor utilization while playing audio through the headphone output mini-jack.
Resolves an issue that prevented the display backlight from turning on after powering on the iMac.
When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update. Do not disturb or shut off the power on your iMac during this update.
System Requirements
Mac OS 10.6.3 or later