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Helpful answers
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Sep 19, 2015 7:35 AM in response to Briemerby OGELTHORPE,First place to look is Activity Monitor:
https://support.apple.com/en-us/HT20146
Look for applications that are using a lot of CPU resources.
Ciao
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Sep 19, 2015 10:24 AM in response to Briemerby Linc Davis,There's a 90-day warranty on the repair. Use it.