I can hear the line-in input. I have it selected and monitored. But nothing will record it. If I select "IDT Audio" for the edit window, I get an error when I try to record in Adobe Audition. I can hear it just fine, though! I also tried Audacity. I tried selecting only the line in as well as "stereo mix". Any ideas? This used to work...

Motherboard is Gigabyte X38

Oops, I meant the motherboard is an Intel D975XBX, aka "Bad Axe"