XP Pro, ASUS P4C800E-D board with "onboard" sound, have some speakers hooked into it which work fine. When I plug in my headphones, they work fine and of course cut out the speakers. Just got a Logitech Pro4000 webcam. Installed it, the video works fine. Tested the sound during the install process, I read the test line into the camera mike, the little sound bars went up and down as I read. However, when I tried to replay my test read, nothing. Had the headphones unhooked and the speakers turned on. Also tried it with the headphones, nothing either way. I'm sure there's just some setting I'm overlooking ?? Both on the webcam control panel, and on Messenger, I have the onboard SoundMax selected for sound - only choice that comes up. Then hooked up to Yahoo Messenger, turned on the webcam, good video, don't think any sound is getting thru. Appreciate any tips / help!