You have had approx. 6 month to study how xorg.conf works and you still don't know
Edit xorg.conf and modify/add the HorizSync and VertRefresh in the monitor
section (example in post #2). These values should match the specs of your monitor (which you can find in the user manual). As you did not give the exact model, I can't tell you what it must by.
Find the default depth in the beginning of the screen
section; it's usually 24. Next look for the subsection display
with that depth and check the Modeline. Only put resolutions there that you want to use and that are supported by your monitor.
If you still have problems, come back with the following info:
make/model of videocard (probably an integrated one)
make/model of monitor
sections device, monitor and screen of xorg.conf
PS I don't have experience with Suse, but I have understood that 10.1 is a bit buggy. You might want to consider to use another version.