First, boot in safe mode then call YAST for online update. This could solve the missing packages.
(If online update failed you can download the packages here:
rpm -Uvh packagename.rpm
Run the following:
Configure your graphic/monitor.
(If sax2 cannot help run xf86config instead)
If the problem persist give your hardware specs more specific. e.g. motherboard, cpu, video card, monitor ...
Have a lot of fun :-)