No sound fromMacBook built in speakers. can only use headphone jack.

The speakers of my macbook have suddenly become mute.
When I press the volume buttons, the volume icon appears, but has a circle with a diagonal line showing.
The hole for the headphone jack is constantly shining a red light from it.
I can use headphone from it, and all volume controls return to normal.
I've rebooted a number of times to no avail.
Any suggestions?

you've managed to activate your digital out, if you cant get it to go off by sticking in the headphones, use the end of a match gently and see if you can get the red light to go off, if not then you will unfortunately have to take it to an apple store

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