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Couldn't get my internal speakers to work this morning. Nothing happened when I tried adjusting the volume - the level indicator bars came up all lit, but there was the circle/slash icon below the bars, plus I noticed a red light shining from the output/headphone port. External speakers work fine, & respond to volume changes.
Don't know if your question is still unanswered, but if so, this looks like a hardware problem. Basically, the MB is 'stuck' trying to output digital audio. You may have to send it in to Apple to be repaired.
(Last edited by mfbernstein; Apr 10, 2007 at 06:51 PM.
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Thanks, mfbernstein - I found that same link the other day, so I'm taking it in this week for the sound card & that damn screen flicker. In the meantime, I have to revive my G4 iBook so I can carry on.