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2012 mac pro 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.
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/
Macbook Pro Red Light/No audio Problem solved. Thread starter catchmeifucan24; Start date Jun 21, 2006; C. catchmeifucan24 Guest. Jun 21, 2006 #1 I noticed there were a number of people who were having problems with the digital audio being stuck on which didn't allow the main computer speakers to work.
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.
SOLVED: Audio connector red light problem. - MacBook …
https://www.ifixit.com/Answers/View/60681/Audio+connector+red+light+problem.
#1 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.
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