I have an 80gb PS3 with 4 USB ports, I have perfect picture on my PS3 but I don't have any sound on main menu, Playing a game or watching a DVD, I am using regular Red, White and Yellow A/V cords, I know it is not my TV because my Xbox 360 still has Sound when I am on it, I was wondering what I have to do to fix it, Do I send it to sony should I buy new A/V cords, please help.