If you can make a "Sound Recorder" voice recording in Windows . You'll find that in Accessories under Entertainment . Then you know the mic is working and it's a AH or you to AH problem .
LYNX taught me this yesterday , in AH type you name in the V channel . You can then test if AH vox is working , if you hear nothing when you brodcast it isn't . You can test that "offline" by typing SERVER in that V box and testing it .
Look for my posts asking for vox help , it might help you also .