I have an ati hd6970. I tried to install iAtkos L2, but when the installation finishes and it reboot automatically, it says "Unsupported Card!", then I see the apple logo, then the screen turns white/gray with the mouse pointer... nothing else... I tried reinstalling using different packages (such as ATY_init, I think this is more or less the name), but nothing changed. with ATY_init I only had a black screen and nothing else. searching at home I found and old (very old) ati X1300, which seemed to be compatible with Snow Leopard, it will be compatible also with Lion I said. so I mounted it on my mobo, having two video cards (both the 6970 and the X1300), I reinstalled iAtkos and now it shows the message in the attached image... have you got any idea on HOW see the Lion desktop? (if I could boot fine almost once I could try to install Netkas packages to try to get the 6970 working...).
If I buy, for example, a supported video card, such as an nVidia 8600GTS, and I install it removing the X1300 (so I would have both the 6970 and the 8600gts installed at the same time), will the system boot up or I'll get the same errors? the problem is that I don't know if Lion will try to use the 6970 or the 8600GTS instead... thank you guys, hope someone could help me