What can damage microphone

I wanna ask about microphone issues. My microphone in system preferences in Sound - Input is Built-in. When i tested in garage band, microphone doesnt detect any voice but detect banging or knocking on upper case. Can by microphone poorly connected on logic board or is just damaged ? Thanks for answers!

1. Launchpad >Utilities Audio MIDI Setup > Built-in Microphone > Input
Make sure that Mute is not checked.
2. Reset PRAM. http://support.apple.com/kb/PH4405
3. Take it to the Apple store and have the MBP checked out.
Best.

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I've a iMac 27', summer of 2012, and my garageband doesn't record by the internal microphone, what can I do, to resolve this problem?

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only for contextualize, in other softwares the microphone record correctly like quicktime, or in facetime, even photobooth. but in garage band not.
i dont know if its a problem of the software, an error of actualization, or a bad configuration. please give me a hand.
cheers.

Did you choose the mic as the input device in Garageband Preferences?

What can damage microphone

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