This Mac OS X hint would seem to address the issue for the new 15″ Powerbooks, so it probably applies to the 12-inchers. I know from time to time my screen will refuse to wake back up after being put to sleep. He says disabling the “Wake for Network Administrator access” checkbox under the Option tab in the Advanced settings of the Energy Saver control panel does the trick. I made the proper changes and will post if I ever encounter the problem again. I hope not.
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