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I just tried resetting the PRAM as you suggested, but no improvement shown. I've tried both the internal speakers and the headphones, but no audio produced. Are there any other ways to restore the audio?

Hey, I have a MacBook Pro, 15', 1,1 , Mac OS X, version 10.5.8, which is completely up to date, with all software updates installed. The internal speakers won't produce any audio at all. The startup sound works when it is turned on, but afterwards, no audio is made. I've already checked...