I reinstalled ubuntu with all 5 cards plugged into it and then using this guide:
http://forum.bitcoin.org/index.php?topic=9239.0;allAfter installing the ATI 11.6 Dirver and rebooting I received a message onscreen that my system doesn't have sufficient hardware and that Unity will be disabled and ubuntu classic will be used.
Now, the system is almost non responsive, mouse flickering, can't start any programs, like a super slowmotion.
Did you stop at the "Headless" bit? If you didn't that's why your GUI is dorked. It's supposed to be headless (no mouse, no monitor, no keyboard).