Dictation and sound input not working on MacBook Pro

There was a bug in upgrading to Mountain Lion that muted my speaker input and output. I had to restart and reset my SMC. To do that you shut down, wait 30 seconds and the restart with the power key holding down the shift option and control keys. Hope this helps.

It sounds as if you're 'stuck' in digital out mode... that usually means that the switch in the port is 'stuck' and you can usually see a red light inside the port.
If you've a toothpick or a set of headphones, etc., try wiggling the toothpick around in the port or plu in and unplug the headphones a number of times to try to flip the switch.
Good luck,
Clinton

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