No output or input sound

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Hello, I have a 2008 macbook. The audio input and internal mic recently stopped working. I went to the audio/midi set-up pane and checked to see if everything was correct, as it was. I noticed that the M (mute) fader in the audio input section of audio devices is stuck to the left position. I can't move it or change any of the values. I am starting to think that my logic board is fried. Does anyone know how to fix the problem without replacing the board?

Thanks
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Try a PRAM reset to see if that gets the sound adjustment back to normal.
 

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