Mid 2009 MacBook Pro 13", OSX Mountain Lion 10.8.2, second display Samsung T24A550. On awake from sleep system alternates Blue Screen / normal display. Resulution is a shutdown / reboot. This problem begain with OSX Lion; original OS Snow Leopard worked.

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tkparker1941 Author

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Mid 2009 MacBook Pro 13", OSX Mountain Lion 10.8.2, second display Samsung T24A550. On awake from sleep system alternates Blue Screen / normal display. Resulution is a shutdown / reboot. This problem begain with OSX Lion; original OS Snow Leopard worked.

Mid 2009 MacBook Pro 13", OSX Mountain Lion 10.8.2, second display Samsung T24A550. On awake from sleep system alternates Blue Screen / normal display. Resulution is a shutdown / reboot. This problem began with OSX Lion; original OS Snow Leopard worked.

MacBook Pro (13-inch Mid 2009), OS X Mountain Lion (10.8.2), Fails to wake from sleep.

Posted on Nov 15, 2012 11:15 AM

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Answer 1

tkparker1941 Author

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Jan 9, 2013 5:19 PM in response to tkparker1941

What appears to be happening is the conputer is trying to sync with the display... over and over. Eventually it MAY succeed, more often than not a power off / on of the display and a reboot of the system resolves the issue. There are no drivers from Samsung to support OS-X. Apparently the change from Snow Leopard to Lion caused the problem, and it persists with Mountain Lion.

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