Having trouble using a microphone that used to work just fine on a Mac Pro

I have been using a USB based microphone/headphone for quite some time now, but for some reason, it has stopped working. The headphones work great, I am not getting anything from the microphone.

I have looked through all the obvious preference panes and they all seem to be set correctly, but still nothing.

Is there something I am missing with this?

P.S. And yes, I have checked to make sure the microphone is not muted. ;)
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