I just bought a Panasonic 42 inch plasma TV, model # TH-42PX50U. I noticed that on HD channels such as ESPN and others that certain shows come through in a 4:3 aspect ratio as opposed to 16:9. I get that black lines on the left and right of the screen or a frame. It also occurs during commercials as well. Is there any way to remove these or change the ratio? For some reason when I try to use the "aspect" button on the TV remote it will not work on HD channels. I believe there should be a way around these especially when you have to worry about burn in issues with these TVs. If anyone can help me with this I'd really appreciate it.