I have a powerbook g4 and 10.5.2 leopard OS. I just bought 2 logitech pro 9000 webcams for me and my gf. I have a mac and she has a PC. The webcam has a built in microphone and my gf is able to hear me talking through the mic of my webcam. But, when she tries to talk to me, I get nothing. Nothing comes out of my internal speakers or external speakers. I went through every settings menu from skype to user preferences to try to change something and nothing works. any advice?