[newbie] Split screen in X

[Brigette Heffner]

I installed Mandrake's latest release on my laptop and everything went fine until I tried to start X.  The screen is split horizontally and I can't make anything out. The laptop low down :  ARM, AMD K6-3 450 Mhz, 14.1" TFT XGA, ATI Mobility - M AGP 2X, 3D Graphics with Floating-Point Setup Engine Video Memory 4MB, 10 GB hard drive. I also have Debian (but I get a keyboard error before I can even start to install) and Slackware 7... Any thoughts? Thanks Brigette