My iMac's got stuck in headphones mode.
My 2011 21,5 inch iMac has got stuck in headphones mode, I am in System Preferences and it says that there are headphones plugged in my Mac.
I can't use neither headphones nor internal speakers (I checked the jack and it's clean and there's nothing in it)
What can I do? Please help me. Thank you.
iMac, OS X Mountain Lion (10.8.3)