Ok, here is my story. I have a Sharp LC32D40U. I just hooked my Comcast cable box up to my TV.

Now, my DVD doesn't work. I get audio (L/R) but no video. I tried new cables with no success.

I tried the DVD using the red/white/yellow cables on another TV and it works. So I know it is the TV. I then tried to use these inputs for the cable box, and same problem.

On thing to note. The component cables do work the DVD video. But I have cables through my walls so it is not that easy to just run component for the DVD. Does running HDMI screw up the old school RCA cables or something?

Check to ensure you are hooking it to the correct input on the TV. Also, try a different input.

I did. Input 1 and 2 (both yellow) don't work any more. I know it is the TV. I was wondering if HDMI screwed up the other inputs or something.

You may have incompatible HDMI problems. Sharp TVs have trouble with one DirecTV receiver too. If you try a yellow input, you might have to set the box to output 480i. Many source devices don't output HD and 480i simultaneously.

Here is what I want to do. Have my cable box set to HDMI, and my prog scan DVD player to Input 1 or 2 (red/white/yellow). Is this possible?

Before I had my cable box set up with component cables and input 1 and 2 worked fine with the DVD player. This problem started when I went to HDMI for my cable box.

Like I said, my DVD player works with the component cables, but I'd have to rerun everything thru my walls.