This error has to do with the XFree86 config file. I'm not sure about Mandrake, but in Windows it's at /etc/X11/XF86Config or /etc/X11/XF86Config-4
This file can be hand-edited or configured via a program such as Xconfigurator or xf86config (I think those are the names of the programs? if you have them installed)
What video card are you using? If you're using an Nvidia based card, go to the Linux section of nvidia.com and there is a detailed text file with everything you need to know about this file to get it to work.
cscgal
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