The hi-definition can only be sent via HDMI.
If you use component you only get low res. form whatever source you use.
The cable box, IF it has hi-def programming, SHOULD BE the one to use the HDMI.
The DVD is being upres'ed be either the TV or the DVD player... let the TV do it and use the component on the DVD to TV player.
If you use component you only get low res. form whatever source you use.
The cable box, IF it has hi-def programming, SHOULD BE the one to use the HDMI.
The DVD is being upres'ed be either the TV or the DVD player... let the TV do it and use the component on the DVD to TV player.

