Originally Posted by robertva

For HD you would want:

HDMI cable (handles video AND audio). Make sure your cable provider has enabled the HDMI output on your converter, that function may be dependent on software the converter downloads when it's powered up or "hit" with a command from the provider's head end.

or

Stereo cable (red and white RCA cables) for audio. Some higher end equipment may have optical audio connections.

With your choice of these video cables (depending on connections available on BOTH devices)

VGA cable (primarily use for PC video output)

DVI cable

Component video (three RCA plugs on each end) These cables typically have different color codes than the red/white/yellow combined stereo/composite cables as an aid sorting out which cables are which at installation time, but are essentially the same cables except for the plastic color markings.

Retailers may offer cables combining stereo and component cables.

Many converters will be equipped with HDMI and component outputs for HD video.