Send component video out from the HTIB to a component video input on the TV. Send a video signal from the HD box to another input on the TV, either S-video or component. You’ll have to use a separate input from what the HTIB will be using. You didn’t mention if the optical connection on...
Is the HD box the only thing they’ll be using for TV vewing? How will they be watching non-HD programming (i.e., getting the signal)? Regards, Wayne A. Pflughaupt