That sounds like either a missing or bad video graphics driver, an unsupported Video graphics adapter, or a mis-configured X/Xorg. Can you post details about your hardware (make/model, etc.) and specifically the graphics adapter (e.g. Nvidia G500/ATi Radeon F500, etc.)?

Also of help would be knowing what type of SUSE (openSUSE, Novell SUSE Linux, etc.) and what version, too.

In the mean time, I would suggest booting up into non-graphical mode and trying to run X itself, thus bypassing gdm entirely. That would at least tell you if X was working at all.

It varies from distro to distro, but typically, you can enter non-graphical mode by intervening at the Linux boot prompt (right after the machine boots up and does a memory test, etc. but before it loads the OS). It should tell you on screen what to do to intervene, but it is often the key, followed by the key to append to the kernel boot args. You want to just put a ' 3' at the end of the list of command line arguments, then hit key. If you never see the boot prompt and it just starts booting linux, then reboot and this time hit the key repeatedly after the machine comes back on. Now it should boot into text-only mode. Log in and run startx and see what happens.

that sounds a bit like the current bug
i had a problem with the current kernel and the current nvidia.rpm
the problem was solved by using the nvidia.run
BUT
there also was a kde issue
so more info would help
please post a thread over at
the opensuse fourm
http://forums.opensuse.org/
or contact your paid for support is SELD