Need help getting an HD picture on my TV

I have a new direct TV HD-DVR. I already have a Mitsubishi TC HD-1080, Model No WS-55805 and a Denon AVR-4800 receiver. I have connect all the components, but on the back of my TV I connect the audio cables to the HD audio jacks and I have a yellow video cable from the Denon receiver connected to the non-HD video jack. When I attempt to connect the yellow video cable to the HD video port, I do not get a picture. There is an HCTV control port that is not in use on the TV. I suspect this needs to be used, but 1) I do not have that type of cable and 2) even if I had that cable, I would not know where that needs to be connected.

Please Help.

Thanks
Paul

[Sonnie]

Hi Paul and welcome to the Shack!

That yellow cable is a composite video connection and it only carries a standard definition signal, not HD. You will need to use the component video input/outputs from the HD-DVR to the Receiver then from the Receiver to the TV. The component is the red, green and blue RCA connections.

[bobgpsr]

You need to use one of the two component video connections. They each use a 3 RCA cable set which need to be good quality 75 ohm video rated cables. A decent component video cable set by Philips, RCA, AR, etc brand available at Radio Shack, Wal-Mart, etc will do just fine.

[eugovector]

As stated, you need to use an HDMI, DVI, or component (Red, Green, Blue plugs) cable. When it comes time to buy, check out monoprice.com, and Episode 1 of my podcast may help you with your cable questions.