Running into the same problems here. I have no working inputs, only deck control.
XFX 630i (close to the recommended 790i) is a no-go with both Vista 64 and XP 64. My MSI motherboard with AMD 4800 and Nvidia chipset, Geforce 8300, and XP SP3 box shows same problems.
Just bought another Gigabyte just to get this to work, but I hate to throw away another $100. Anyone have good luck with motherboards that are not on the compatibility list???
Dying on the vine here… Would love to fix for $250 or less…