Hi,
I had the same problem, My internal speakers were not showing in system preferences, but when you turn on the MacBook pro, you hear the gong, so I know my speakers was working ok
so I used compressed Air in the jack port...Nothing
tried to clean the jack port...Nothing
Poked things in the jack port...Nothing
reset the VRAM...Nothing
so I thought outside the box, So I squirted some good old WD40 into the jack port (the Macbook Pro was switched off) then I pushed in and out a 3.5" jack in the port a couple of times and then left the Macbook Pro powered off for about 40 mins, then when I powered the Macbook Pro back on
BINGO, my internal speakers are now working OK....YIPPEE
So I am guessing that the WD40 freed the stuck switch in the jack port.
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I tried all these solutions, and nothing worked for me. I've looked with a magnifying glass and there's not much going on in there. Mine was strange too. The red light was on, but I was still able to switch between sound types, but the headphone sound was really scratchy.
In the end I just bought a USB audio interface for $10, which as a workaround, works just fine. I plug my speaker system into that.
Just want to put it out there, that there are also optical to analog converters for not too much money, so if you're really stuck, you can do that instead of forking over big cash.
von Ariel