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SOLVED: Audio jack problem, no speaker sound, red light ...

    https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light#:~:text=The%20red%20light%20in%20the%20headphone%20jack%20means,the%20port%20operates%20in%20optical%20or%20analog%20mode.
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Red light in headphone jack and no sound … - Apple Community

    https://discussions.apple.com/thread/3694502
    a few things might work - i had the same problem. for a working fix - go to system preferences --> sound --> sound effects and choose 'use audioport for - input'. plug in headphones and your mac speakers should work. this will disable your mac's built in mic, so unless your headphones have a mic, you wont have audio input until you change this setting back.

SOLVED: Audio jack problem, no speaker sound, red light ...

    https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light

    MacBook Pro 13 Audio FIX, Red Audio Light FIX 100% …

      https://www.youtube.com/watch?v=XGi4CeNdr1U

      SOLVED: My headphone jack glows with a red light - …

        https://www.ifixit.com/Answers/View/59477/My+headphone+jack+glows+with+a+red+light

        Strange red light from my MacBook Pro – mkaz.blog

          https://mkaz.blog/misc/strange-red-light-from-my-macbook-pro/
          Grab a Nice and Clean Sharp Toothpick, and find a LIttle dent on 7’oclock position. and push that little dent for a several times, At first it will blink a few times, and keep trying until the red light go off, It took about only 2 minute! also make sure you won’t damage any other port or parts, you have to push the toothpick very gently!

        MacBook speakers off, red light coming from the headphone jack

          https://apple.stackexchange.com/questions/261282/macbook-speakers-off-red-light-coming-from-the-headphone-jack
          The red light is probably because its a Mini-TOSLINK port. There is a metal prong in the jack and sometimes it can be bent , causing the digital audio to be turned on when it shouldn't be. The problem is there is a switch in the jack that tells it if you have a mini headphone plug or an optical plug plugged into the headphone port .

        Macbook Pro Red Light/No audio Problem solved. | Mac-Forums

          https://www.mac-forums.com/threads/macbook-pro-red-light-no-audio-problem-solved.36726/
          first, plug in a USB device (iPod, hard drive, etc..) (I used an iPod) Next plug headphones into the headphone slot, then uplug them. This should turn off the optical light. Like i said this did work for me, I am making no promises but I had tried everything, and this did it. J.

        How To Fix Audio Problem on Your Mac | RED Light - …

          https://www.youtube.com/watch?v=ikN3X9NOiDg

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