Lost my monitor in KDE

I just switched monitors on my Mandrake 9 box and
can't get into KDE. Following previouse threads in
discuss I've learned where to look in my
"/etc/X11/XF86config-4" file and found where the old
monitor is defined. Can I directly edit this file with
vi to update it to my new monitor, or is there a
utility I should be using?

Thanks for your help,
Alex

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