Problem setting up ATI TV Wonder 650 for HD

[Gabe]

Hi all,

I recently got an ATI TV Wonder 650 in order to add to my system to add HD capabilities to SageTV. I've added the ATI card's digital tuner to SageTV, but every time I try to tune a digital station I get a "no signal" message. (The ATI analog input gets snow because it's not connected to the antenna). The card tunes digital stations ok using the ATI Catalyst Media Center.

I've noticed that some people have the ATI card successfully set up -- any suggestions on where I've gone wrong? Could it be that I should take out the Hauppauge card and try to use the ATI for both analog and digital tv? Should I try a different mpeg2 decoder (I think I've got the one that came with the ATI card selected -- the Cyberlink decoder).

Thanks!

Here's more info on my setup:
Sempron 3100+
NVidia video card (6200 I believe)
512mb RAM
ATI 650
Hauppauge PVR-250
WinXP Pro
SageTV 5.0.4 (or whatever is the latest)