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Oct 21, 2015 10:24 AM in response to BNEWBby OGELTHORPE,Try a SMC reset:
https://support.apple.com/en-us/HT201295
If no success, run an Apple Hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Ciao.