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That is absolutely true. Using RCA cables will make HD look worse than a regular TV. Same for component cables depending on the signal and the TV. DVI or HDMI are the only ways to go. HDMI is preferable because one cable carries the audio too. Some older boxes have DVI outputs only, but you can...

Hopefully you can make use of an HDMI cable, or at the very least a DVI-to-HDMI cable. That is the way to go.