I have a 'Logitech Quick Cam Pro 4000' Web Cam, which I use with MSN Messenger. I have been trying to connect to my sis who has a 'Medion MD 5319' Camera. We both have Windows XP. When wishing to hold a voice/video conversation my sis can see me and hear me but I can only hear her - all I see is a black screen (with a little video of me in the corner of the black screen). I have done all checks which tell me the camera is working ok. Can anyone tell me why I get a black screen ? Is it my camera at fault or my sis ?. Grateful for any help, ta.