The optical out has been known to get stuck on. The red light shining out of the port makes it obvious what's wrong.Lots of people on different forums suggested inserting something into the headphone jack and wiggling it around. I used a plastic paper clip and it worked for me.
FYI, my volume control was completely frozen and reboots did nothing.
Thanks for the tips.
Tried putting the headphone jack & wiggling it.
Tried blowing air.
Then, tried the paperclip trick- WORKED!
I signed up just for this forum.
Thank you apple people. Much love.
God bless!
-mailin
Not to be crude, I tried everything suggested, no workie. Then I blew in and out of the headphone jack hole, and viola, workie
Couple of things to try:
1. Do you have a red light coming out of your headphone jack? That indicates that it's outputting digital sound due to a stuck contact. Try inserting a headphone plug a few times and wiggling it around to unstick it.
2. Try opening and closing GarageBand to reset your audio settings.