video fails with more than one monitor connected

I have two dual head video cards, both ati radeon x1550, and I use three monitors in Windows. I installed OpenSUSE because it seemed like people were having greater success with > 2 monitors than Ubuntu, where I could never get the third screen working.
If I boot into SUSE with only my primary monitor connected, everything goes fine, the screen resolution is correct, it’s glorious. However, if the other monitors are connected (and I don’t want to disconnect the other two every time I reboot) video fails entirely. I am not sent to a command prompt. The monitors display a “no input” message and then go into power saving mode. Alt + Ctrl + Fn all do nothing; all I can do is restart.
I am clueless about X server stuff and am completely new to OpenSUSE.
Any help would be greatly appreciated.