From what you typed, I think that the most likely problem is that SuSE couldn't recognize your Monitor, you have to check this.
If you are using SuSE, try to boot in Failsafe Mode, this will boot in a console, once you are there, change to root and then use sax2:
Password: (type your root password)
Once there try to reconfigure the monitor, if your monitor is not listed, use a generic one but make sure you put the Horiz and Vert frequencies and the size of the monitor correctly. If you are not sure about this specs use google to find out them.
In any case, post the result of the following command:
cat /etc/X11/Xorg.0.log | grep "(EE)"
this will give us more info about your problem.