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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
https://discussions.apple.com/thread/3694502
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 side while it's plugged in. Repeat as needed. If no luck, take the machine in for repair under your warranty. View answer in context ★ Helpful wjosten Level 10 (95,297 points)
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 "Red Light" audio fix - YouTube
https://www.youtube.com/watch?v=whzcJYavU4c
Try this at YOUR own risk! This is the red optical light, no internal speaker output, headphone jack fix for macbooks. It may not permanently fix it though.
Why is there a bright red light coming from my MacBook …
https://www.quora.com/Why-is-there-a-bright-red-light-coming-from-my-MacBook-Pros-headphone-jack
A red light inside of the port indicates that the 3.5mm optical (digital) audio output is active, which is usually caused by dust or debris inside of the port that needs to be cleared. Clearing the dust or debris with compressed air or a plastic toothpick seems to work for a lot of people.
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