hey! guys. i have bought a new webcam(LOGITECH).i cannt use it on Y! messenger.dis is because it displays dis: no camera connected. hows dis possible.i clicked lots of pics from the cam after dat it worked perfectly. when i previously tried Y! displayed dat i was behind a firewall and thus i couldnt use the webcam.(I USE AVAST).i switched of avast protection.but still the same prob i was behind a firewall and thus i ....so please find me a solution guys.