Hello, I have a 19" vizio led lcd tv. I hooked up my computer to the tv and everything was okay. For awhile the sound was there, then it started fading in and out and I would have to reboot my system to get the sound back. Now, I am getting no sound at all. I decided to get a 3.5mm audio cable to connect from the pc my tv, rebooted and still I get no sound at all. Can someone please help me? What is the problem?