New answers tagged speakers
The switch in the headphone input could be stuck, you can put in a headphone jack and wiggle it around. Don't be afraid to use a little force, just don't break of the plug. I had this problem too and this solved it for me at least.
Try switching back to your internal speakers with [alt]-clicking on the speaker icon in menubar. Many interfaces don't support volume adjustment and thus the control becomes greyed out.
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