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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
It may mutilate the red light, but will not fix the audio. This is a common software issue on Mac OS X 10.7.5 and earlier versions. Unfortunately there was not software hotfix ever released. The problem you are experiencing is that the computer does not recognize the "internal speakers" as an active sound component.
SOLVED: Audio jack problem, no speaker sound, red light ...
https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light
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 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 .
sound - Red light from headphone jack Macbook Pro …
https://askubuntu.com/questions/643757/red-light-from-headphone-jack-macbook-pro-running-ubuntu-14-04
These are the steps to solve red light audio jack issue in Macbook. open system settings. go to output tab, select speakers - Built-in Audio option under Play sound through category. look for the mode option under settings for speakers category. Change mode from Analog Stereo Output to Analog Surround 2.1 Output or Analog Surround 4.1 Output. Enjoy!
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