Sound output permanently digital out???

Hello there, folks
Yesterday I was at a shoot and brought my laptop just to check email periodically. That is truly all I did. And yet, at a certain point I went to play something out loud and when clicking the volume button it seems I can't control the sound, and I don't hear anything.
When I go into preferences it reads:
Digital Output - built in output
When I plug in headphones that changes to:
Headphones - built in output
and I can hear again.
Still, I have never used digital output. Why is that the new default? Where did my other option go? How can I fix this?
Thanks in advance for any enlightenment!
- Fredo

Plug your headphones in and out a couple of times. Check the jack for things like lint. There is a switch in the jack that detects the insertion of an optical cable which disables the built-in speakers. The switch is in the position that says an optical cable is plugged in even though it isn't. There is probably red light coming out of the jack.

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