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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.
Why is there a red light in some 3.5mm audio jacks? - Quora
https://www.quora.com/Why-is-there-a-red-light-in-some-3-5mm-audio-jacks
The red light is the optical “sender”. There’s a little switch in the jack that’s supposed to tell the computer which sort of cable has been inserted, but sometimes it gets dirty and doesn’t connect, or the computer’s software gets confused. Whatever it is, the computer thinks there’s an optical cable inserted, and turns on the light.
Headphone Jack Red Light Problem | How To Turn Off …
https://www.youtube.com/watch?v=dXm9k9BVIAk
Headphone Jack Red Light Problem | How To Turn Off The Sound Card Red LightI saw red light in headphone jack after i formatted my computer. I explained how t...
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