When I unplug Apple headphones from my MacBook Pro sond from internal speakers not work, and system soud preferences displayed: Output: optical digital out port only

When I unplug Apple headphones from my MacBook Pro sond from internal speakers not work, and system soud preferences displayed: Output: optical digital out port only

If you see a red light in the audio output port, then the internal switch is stuck.  Insert the earphone plug a few times and see if you can trip the switch.  If that fails, insert a cocktail stirrer and the like and jiggle it around inside.  If that fails, take it to an Apple store and have the technicians at the genius bar do it for you.
Ciao.

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