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Helpful answers
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Dec 27, 2013 3:29 AM in response to anu.idsby dominic23,http://support.apple.com/kb/HT2090
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
Best.