No Audio on internal speakers

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got trouble can't fix. appreciated.

macbook has no more audio on internal speakers. running lion 10.7.4 no software updates available. did nvram reset multiple times including 1, 2, 3 , 4 chimes without success. when connecting headphones sound output work. sound output switches 'digital out' 'headphones'. without cables/speakers connected sound output returns 'digital out' without audio. there no sound output named 'internal speakers'.

advise? genius bar, stuck eternity, trash , buy new 1 (seems shame)....
 

just changed 'use audio port for' 'sound input'. under sound output devices 'digital out' changed 'internal speakers', plugged headphones in , have audio on internal speakers. sure wasn't designed way workaround works.

advise on finding way original setting 'internal speaker' option 'sound output'?
 


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