Trinity on newer Dell

Haven't been having luck with a new Dell Precision T5500n (2 x dualcore "E5503" and 12 GB RAM).

The problem seems to be the ATI FirePro V7800 card.

I can install Ubuntu Natty on it no problem.

However, when I try to load the preconfigured Trinity/Maverick disc, I get the little "keyboard = human" screen and can escape to the menu, but when I try to "try Kubuntu without installing" I get the Kubuntu logo with the progress dots ... then nothing.

In fact, nothing with the monitor icon indicating that the display lost the signal.

Can I install the Trinity packages onto an Ubuntu Natty installation instead?

Peter