I'm new and most of the posts I read are over my head so please forgive me. I have a Dish for my hd signal. I hook up my HD signal from my dish (15 pin)directly to the 15 pin input on my z9000. I have a firehawk 113 diag -I think. In standard mode the picture is small and when I switch to "dot by dot" it cuts off the tops of evertbodies head. What am I doing wrong?