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Helpful answers
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Jan 3, 2016 6:41 AM in response to robindash7by OGELTHORPE,I would try SMC and NVRAM resets:
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
If no success, run Apple diagnostics and see if that provides a clue:
https://support.apple.com/en-us/HT202731
Ciao.
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Jan 3, 2016 6:59 AM in response to robindash7by OGELTHORPE,It will have NO affect on your user data. That said, you should always have your data backed up, preferably with two independent drives.
Ciao.