ok so i just noticed that my ichat sound when im in a video chat has disappeared. its been missing for like 4 days, and i havent been able to fix the problem during video chatting. if im iming someone i dont get an sound alert to know they have sent me a message i get the number but i dont get the popping sound that you get when your iming AND also in video chat. and it all of a sudden stopped working. just to let you all know..its not the regular sound when iming its like a "pop" Please help!