Just a minor update. I have solved the problem by installing envyng-qt which downloaded and configured appropriate ATI drivers. I now have OpenGL and, moreover, my monitor now runs in its native resolution via HDMI cable (before it was only possible to run it in full res via VGA/DVI cable). Still, when I try to run borderlands, I get an error message saying "device does not support 1x32 fp renderer" Any ideas?