I can play XBL and my mic works flawlessly, I don't get the static that everyone talks about and when people are using my mic they sound perfect. BUT when I switch over to my PC I get the sound in the headset but then the mic just stops working and absolutely nothing is picked up by the mic then. The part that concerns me is that 3 months ago the mic worked fine for talking on Ventrilo while I play WoW so I am confused at what could have changed between then and now. Possibly a windows update that might have messed it up?
Have you gone through the mic setup wizard to see if that helps?
If you open the Sound Settings -> Recording Tab -> select the mic -> Properties -> Levels Tab -> Make sure Mic Boost is maxed.
Apply those settings and then click the Listen tab. Check "Listen to this device" and start talking. See if you can hear yourself after the boost. (also make sure your playback device is set correctly)
I think I might have a solution. If there is a little switch that says Xbox-PC2/ PS3-PC1, switch it to the opposite of what it is already set as. If the sound quality of the headset gets worse, follow these steps.
1. Go to Control Panel
2. Hardware and Sound
4. Set the Speakers, High Definition Audio Device to the default device
and the default communication device.