I just bought a Sony HD100 for my second system. It works just fine and was able to receive all of the digital and analog channels in my area. I know that I can not change the aspect ratio in 1080i mode. It is filling my screen when I am watching HDTV content. However, it is not filling my screen in other modes. The picture is being shown in the 4:3 format with grey bars on the side. I am sure this has been asked and answered before. But if you know the answer, please help. Thanks.