Hi ! My powerbook G4 don't recognize the built in microphone

There are 2 weeks , i used my built in microphone to record my voice in GarageBand but today, when i launched GarageBand to make a new recording, i had seen that my internal microphone don't work. So i am gone to preference system=>Sound. and i saw that the built-in microphone wasn't listed as an peripheric of entry. It's was found. i shutted the machine down , restart it holding option command p r , jusk it restarted again but nothing has changed.
the built-in microphone isn't recognized in the sound preferences system.
Please help, i really need this mic to record my voice . Any advice will be helpful. Thanks

Try zapping the PRAM.

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