Sounds like your monitor settings are set wrong.
Check the specs for your monitor, especially the horizontal and vertical rates. These should be in the manual or go to the manufacturers website. Then double check these with the settings in XF86Config (in Redhat: /etc/X11/XF86Config) in the section headed with: Section "Monitor". If these don't match, first backup the original file and then change the settings by hand to match the manufacturers recommended maximums.
You may also want to change the resolution to something comparable to Atari at least to you get X running. At the bottom of XF86Config is section "Screens", change the display to 8bit and the resolution to 640x480. Once you get X running, crank it back up.
Then run startx and cross your fingers.
Last edited by Capt_Caveman; 03-13-2003 at 10:00 PM.