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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Jan 5, 2016 2:09 PM in response to BrianS115by Gary Scotland,test if the issue is the headphones or the Mac, use another set of phones to test.
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Jan 5, 2016 3:02 PM in response to Gary Scotlandby BrianS115,I have used multiple pairs of headphones and reset the NVRAM with no success