HT204063: How to Reset NVRAM on your Mac
Learn about How to Reset NVRAM on your Mac
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Helpful answers
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Jul 1, 2016 8:42 AM in response to Oumeyaby leroydouglas,If you hold the option key and click your battery icon—what is the condition?
If anything but normal I would fix the battery issue first, it can lead to your erratic behavior.
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Jul 1, 2016 11:09 AM in response to Oumeyaby OGELTHORPE,Run an Apple Hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not conclusive.
Ciao.