I already check my audio device volume. start -> control panel -> Sounds and audio device There are five tab : volume/sounds/audio/voice/hardware in voice tab voice playbak default device : soundmax digital audio if i click volume, only 'line in' I can see mute checked. voice recording default device : Logitech Mic (Notebooks Pro) if I click volume, I never see any check in mute all check box And I also tested with using sound recorder in start -> accesory -> entertainment play song and record the song. and I can hear the recorded song using Logitech Mic. But if i try the voice chatting with MSN Messenger, I can't.... why??????