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When I was installing Windows on my 2015 MBP yesterday, I noticed that there was a light inside of the headphone jack. I never knew it had optical audio! You learn something
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Weird light on MacBook Pro 2012 13" I'm currently trying some Linux-Distributions and came across a light coming out of the headphone-jack. What is that light?: macbookpro
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10 troubleshooting steps everyone should follow in case of no sound / no audio from Mac - Hawkdive.com
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Macbook Pro sound doesn't work via internal speaker, red Light coming from the headphone jack, Sound Icon Greyed out, How to solve - The DNetWorks
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