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Apr 17, 2015 4:49 AM in response to 50417by OGELTHORPE,Try SMC and NVRAM resets:
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
Run Apple diagnostics. That may provide a clue:
https://support.apple.com/en-us/HT202731
Ciao.