Fading microphrecording volume Dell Inspiron 6400

  indiasun 15:12 27 Jul 2006
Locked

I have a Dell inspiron 6400 with Windows XP Media Center 2005 with a Sigmatel STAC 9200 sound card. While talking on Yahoo messenger with voice the microphone ( Logitech Desktop microphone) voulme goes down automatically within a few seconds of starting the conversation and I have to bring the microphone right next to mouth. In the recording volume control panel the volume tab can be seen going down untill it touches the bottom. I have tested the recording system ( start- accessories- entertainment- sound recording) and it works fine. Have written to Yahoo - no reply so far. Dell say not a Hardware or Software problem.
Any help will be appreciated.
Thanks

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