Can I disable the internal microphone

Hi,
I have been trying to disable the internal microphone on my eMac (1.42GHz PowerPC G4) with no luck.
Okay to start at the beginning...we have a new application that uses headset with microphone. I have updated the Sys Pref to point to Line-in, but it does not pick up the external microphone.
I have updated the Utilities- Audio Midi Setup - Audio Devices - so that the Audio Input also says Line-In.
I cannot change the System Settings (Default Input/Default Output/System Output/Properties For) which currently say "Built-in Audio', because there is nothing else in the drop list selection.
It was suggested that I disable the internal microphone to force the Line-In to work, but I can't figure out where to do such a thing.
Any suggestion? Please.
Thanks much.
Stella

Evidently the headset/microphone combo purchased is not compatible with my eMac. Interestingly using the LineIn add-on I was able to get some sound picked up by the eMac?????
It turns out the person who originally suggested disabling the internal mic to me had actually flipped her settings back to using the internal mic without knowing it and sent me on a wild goose chase. Thanks all to responders for all your knowledge

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