Over Freq Monitor after Install

I finished the entire YAST installation, including patches to the current packages. Yay! I did my reboot and when it came up, the monitor I had barfed with an Over Freq signal on the monitor and shut down. I put on another monitor and it worked OK, I logged into KDE. But... If I don't have an extra monitor available, how do I reconfigure X to a lower Freq Range since I can't run the GUI? I'm more than a little green on how Suse does this configuration management stuff. I've always used systems that are CLI configuration only. Can I launch something from CLI that is at least "safe" without too much trouble?