I just received my 503cmx from Dell and got it hooked up to my Time Warner HDTV cable box. I have it attached to there component cables to bnc adapters to the RGB on input 2. The HD stations look very good, but the regular channels have the wrong aspect ratio and they are not showing full screen, most have black or grey edges around the corners. I looked at the settings for input 2 and do not see anything to change. I am having to use input 3 via the s video connection to get full screen on the standard cable channels. I am pretty sure this is something pretty simple that I have missed. I am new to this. Thanks for all the help.