I lost my internal speaker as a choice in output sound in system preferences.  There is nothing on my output list.  Now everything is stuck on mute...how do I fix this?

I lost my internal speaker as a choice in output sound in system preferences.  There is nothing on my output list.  Now everything is stuck on mute...how do I fix this?

It was red earlier, but not now.
Then try again. The red light indicates that an analog plug jammed the digital audio-out port in the "mute" position. The spec for the tip-to-shoulder distance is apparatenly tighter for digital ports than it is for analog plugs.
On my MacBook Pro, I insert the headphone plug only enough to hear that I have proper sound, and then quit pushing. In this photo, the headphones are giving proper sound quality and separation but the jack's stop shoulder, on a pair of name-brand headphones, is obvioulsy not touching the computer case.
The iMac has the same kind of port. Don't stick plugs in all the way--just until you here proper sound.

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