I was recording with GarageBand with an old mackie interface on my macbook pro and I changed the sound output/input to that. session went well, then, I disconnected the interface. then, i went to play some good ol' Foxy Shazam on iTunes and couldn't hear anything! so i went to system prefs / sound / output. it says its connected to "digital output" and and doesn't show built-in output and the sound icon on the top right corner is grey. i reset the PRAM and tried everything else. nothing helped. other than that i love mountain lion much faster much more stable
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