Problem with Hauppauge WinTV PVR-500 tuner 2

I have a Hauppauge WinTV PVR-500 sitting on an Intel D955XBK with a Pentium D 830, running Windows MCE 2005. Of the two tuners on the card, one works fine. It displays well, records well, etc. The other looks like there's no ground connection to the incoming cable signal. I get fuzzy sound, a snowy picture, and generally what looks like a bad cable connection. The strange thing is that since the two tuners share the same connection, I would expect them to exhibit the same output behavior. Anyone know how to further diagnose this problem?

Thanks for the tips. I tested with WinTV2000 per Hauppauge's recommendation, and the card is now on its way back to Newegg. Oh well.