Maybe it just doesn't? Computers can be like that sometimes. Try swapping out the cards to different slots if that's possible. How far into the load does your computer go before it restarts? Does it start loading windows at all?
I tried that, and it does the same thing. The computer shows the BIOS splash screen and then restarts over and over again until a screen shows up that lets me enter the main BIOS screen or load defaults. And loading defaults is the only way to get it to work. And after I load the defaults, the computer boots up but my monitor says no input until the login screen shows up.