There have been a TON of issues with HDMI on the 10-250. The main culprit seems to be the HDMI card in the unit does not sit properly in the motherboard. Over on the TiVo boards people talk about having returned 4 different units and not had one that works yet. They proabably just told you that rather than eating yet anoter return on your unit. That being said, Spiky is right. Use the component. I did not see a difference myself between the 2 and there are alot less hassles.
"We are only immortal for a limited time." -Neal Peart