Prova a vedere i suggerimenti dati in questo articolo da MacFixit e nelle discussioni Apple correlate:
http://reviews.cnet.com/8301-13727_7...html?tag=mncol
in particolare:
I fixed this by going into sounds preferences and selecting Headphones in the sound output device menu. I've got external speakers plugged into the headphones socket and these are automatically detected and listed a headphones. When I unplug the speakers the option in the preferences menu reverts to internal speakers.
The other option visible in the sound output device menu is 'Screenflick audio device, and for some reason the system had defaulted to this option automatically, resulting in greyed out audio symbol and no sound. Working fine now.
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