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Helpful answers
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Feb 15, 2014 8:30 AM in response to hallby dominic23,★HelpfulReset 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".
Power button
Sleep function
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Feb 15, 2014 9:20 AM in response to hallby Strawb268,★HelpfulTry the SMC reset but did you by any chance try to wake it from sleep just after it went dark? If so, see these threads:
https://discussions.apple.com/thread/5118135?start=0&tstart=0
https://discussions.apple.com/thread/5475679?start=0&tstart=0
and several others.