Why doesn't my MacBook Pro recognize external microphone?

I have MacBook Pro that I purchasd 1 year ago. Have tried 3 different headsets by 3 different companies and the microphone is not recognized, my voice keeps going through the internal microphone, even after changing the settings. One had a jack connection, one was wireless USB, and this 3rd one is wired USB. I tried the wired USB on my old white MacBook and the microphone worked. So how can I get the microphone to work on this laptop? Must be missing something obvious. Thanks.

MacBook Pro, OS X Mountain Lion (10.8.5)

Posted on Feb 12, 2014 12:45 PM

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Why doesn't my MacBook Pro recognize external microphone?

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