Just loaded Windows XP on my Pentium machine with a built in sound card (Asus P4S533 w/ C-Media CMI-8738 Chip) and now my microphone does not work (it did when running Win 98). I've tried another mic, but no luck. It is plugged into the mic jack, not the line or speakers. When I go to Control Panel - Sound and Audio Devices - Voice Tab : The "Test Hardware" hears no sound for mic setup. Under Voice Recording the Default Device is C-Media Wave Device but the Advanced button is greyed out (unable to pick). The mic is selected under the Volume button - recording control and volume maxed out. Help, what am I missing? I need the mic for Yahoo Messenger.