External Microphone Problem

I have just upgraded from a G4 PowerBook to an iMac Core Duo and I'm getting odd behaviour with the Sound Preference Pane.
Whenever I plug my external Logitech USB Mic in, it only works if the Sound Pref Pane is already open and then left open. As soon as I close the Pref Pane, the sound input stops.
If I then re-open the Pref Pane, the Mic is listed as an input source but there is still no input registered on the little input meter. To get it working again I have to unplug the Mic and plug it back in whilst the Sound Pref Pane is left open.
This problem is slowly driving me nuts. I'm pretty sure there is nothing wrong with the mic as it works perfectly on my PowerBook. I read a post concerning a similar problem with USB speakers, and the solution was to leave the pref pane open at all times. This doesn't strike me as very elegant!
Anyone experienced this with a sound input before?
iMac Core Duo 20"   Mac OS X (10.4.5)  

what is wrong with the built in mic? I think it is
pretty good.
I was wondering if you could tell me how to use the built in mic with skype. No one can hear us - what settings do I need to change?
thanks

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