Audio inputs no longer works.

About 2wks ago I started having a problem video chatting in iChat. The video worked great and I can hear the audio output from the other person in the chat. However, the person on the other end of the chat can't hear me.
When I checked the microphone settings for iChat I noticed iSight was no longer available in the drop down menu. I tried a different iSight that I know works and still nothing. I tried plugging into a different firewire port, but nothing. So I went into the "System Preferences>Sound" and the iSight doesn't show up there either. I plugged in an external mic into the line-in and I still don't get anything. I even tried just doing an audio recording in Quicktime to see if the issue was with iChat but that had the same result.
So ... I think the issue is with the line-in driver. Anyone have any suggestions. Thanks in advance.
4 x 2.5 GHz PowerPC G5 Mac OS X (10.4.8) 4 GB DDR2 SDRAM

atticus1214-
You try this?
Luck-
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