Corry, how many sets of yellow, red, and white plugs combined are on the back? My 1999 Panasonic TV has two sets and they are all lined up. So you want to make sure you do not have the audio cables connect to, say, Video 1 with the yellow video cable is connected to Video 2.
When you are watching TV, does your remote have a button to switch between video inputs? I know that with my DVD player, VCR, and game systems, I have to select Video 1 or Video 2 on the source selector. But when I watch TV, it is set to tuner, antenna, or whatever it is called.
Does this help you at all?