Can't access the desktop

Hi, i decided to try openSUSE. First I downloaded the KDE 4 LiveCD, but when kdm had to start I just got a black screen. So I downloaded the DVD, but whatever desktop I install (Gnome or KDE 3.5/4.0) I always get the black screen. Pressing CTRL+ALT+F1 shows me the login screen in the console. My video card is a ATI Mobility Radeon HD3450. I tried a lot of distros, but only got this problem with openSUSE. How can I resolve?

To at least get a desktop try:

sax -r -m 0=vesa

Then perhaps upgrade Xorg by adding the repo:
http://download.opensuse.org/repositories/X11:/XOrg/openSUSE_11.0/

The command does nothing.

1 ) login as normal at the prompt,then, once logged in,
2 ) type su & press enter
3 ) type root’s password when asked
4 ) type sax2 -r -m 0=vesa & press enter.
5 ) check the configuration & then test & save
6 ) back at the prompt,type exit & press enter.
7 ) you should now be back to normal user.
8 ) at the prompt,type, startx & press enter.
9 ) ( hopefully :wink: ) Et voila, a desktop

Andy