Currently Being ModeratedJan 3, 2013 11:06 AM (in response to Guffy2013)
Follow the steps suggested in the above linked article.
Reset PRAM. http://support.apple.com/kb/PH4405
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 these steps do not help, contact Apple.
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