Both cards? whats your other card you want to boot with?
No, a system won't work with multiple cards, not unless its SLI compatable, and ATI cards aren't yet and you need special motherboards and the same card.
HA! I FREAKIN GOT IT! it was because I had both cards installed, somebody told me that's how you were supposed to do it. Sorry I took up so much of your time with such a simple problem but thanks a lot man!
i love these the radeon cards but the best way to install them is always load the driver into the system before you install the hardware. then when you have installed the card and you boot up it will find the correct driver.
this way it does not give windows a chance to install default drivers