Apple says it's identified a glitch in iBooks and new FireWire PowerBooks that can prevent the machines from coming out of sleep mode properly and has posted a fix to the problem on its Web site. Apple says the bug is rarely encountered, but it involves the "Preserve memory contents on sleep" option in the Energy Saver Control Panel. After installing the new Sleep Memory Extension 1.0, this option will no longer be available.
The fix can be downloaded at http://www.apple.com/hardware/articles/sleepext.html.
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