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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.
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
15 Answers. The red light in the headphone jack means that the MacBook Pro thinks that an optical audio cable is plugged into the port. Try unplugging and replugging a headphone plug into the port several times. There is a tiny sensor inside the port that determines whether the port operates in optical or analog mode.
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/
NOTE: This is one a late 2008, a1278 MacBook unibody. The macbook pros may be slightly different, but you can figure it out with a connectivity meter and some fiddling maybe. They also could be exactly the same, I don't know. macbook audio jack fix - Imgur
Red light in headphone jack and no sound … - Apple Community
https://discussions.apple.com/thread/3694502?page=2
Jan 29, 2012 10:17 AM in response to dpeast12 In response to dpeast12. Your analog/digital switch in the port is stuck -- the red light is the dgital audio signal. Try the headphone plug again, this time wiggling it from side to …
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