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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#:~:text=The%20red%20light%20is%20probably%20because%20its%20a,an%20optical%20plug%20plugged%20into%20the%20headphone%20port.
Red light in headphone jack and no sound … - Apple Community
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.
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.
Red light in audio jack, no sound! Help! | MacRumors Forums
https://forums.macrumors.com/threads/red-light-in-audio-jack-no-sound-help.573822/
It sounds like it is jammed in optical audio out mode. There's a microswitch that turns the port on and off. Looking into the port, the switch is …
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... Some of those jacks are combination electronic-optical — what comes out depends on which sort of cable you plug in to it.
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...
Red light from audio jack | Mac-Forums
https://www.mac-forums.com/threads/red-light-from-audio-jack.142431/
Aluminium Macbook 13.3". Feb 21, 2009. #1. I have an aluminium macbook, i have put windows XP on it, everything was working fine, then i updated bootcamp to the 2.1 update on the apple website and since then i have had a red light coming from the audio jack, i have never had anything plugged in to it and now i have no sound at all.
A red light is coming out of my PC’s headphone jack after ...
https://www.quora.com/A-red-light-is-coming-out-of-my-PC%E2%80%99s-headphone-jack-after-windows-10-update-what-is-the-reason-behind-it-and-how-can-I-fix-it
If a red light shines out of a “headphone” socket, then that means it’s a dual-purpose output, both analog audio, or alternatively, optical digital audio. Without further details it’s impossible to know what’s happened, but it sounds like there was an audio driver hardware driver update included in the Windows Updates recently installed.
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