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May 18, 2016 11:57 AM in response to ldquallstoddby OGELTHORPE,First try a SMC reset:
https://support.apple.com/en-us/HT201295
If no success, check Activity Monitor for applications that may be using a lot of resouces.
https://support.apple.com/en-us/HT203184
Also run an Apple Hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not conclusive.
Ciao.