You really need to go though the bios and disable your old card. I'm wondering if you have some sort of conflict or something... Though, if you want to continue with two sound cards, just be sure the Santa Cruz is set to be the default recording card, and also be sure it's selected under RECORDING in Volume Controls. Don't just unmute it, as it must also be the selected source.
I'm really not sure what the default soundcard would be. I suspect it would be the last one inserted(IE the Santa Cruz) but I really don't mess around with two soundcards in a machine as it's rather pointless
