HP Media Center with GeForce 7300 LE.

I have an HP MediaCenter desktop (WinXP, 2GB, 320 HD) with a GeForce 7300 LE graphics care.
The machine has been back to HP twice (dead motherboard and then dead CPU) and now is out of warrantee. It did work fine with my Satellite box until it died.
I got it back and hooked it up to my Satellite box and Media Center setup says that there is no tuner recognized and there is no output through the card.
I have tried going through the settings to see if there is a way to switch the capture function on, but can't find anything.

Can you help?


Here are the specs:
Graphics Bus Technology PCI Express
Memory Interface 64-bit
Memory Bandwidth 5.2GB/s
Fill Rate 1.8 Billion pixels/sec
Vertices/Second (Millions) 338
RAMDACs 400MHz

Thanks!