Im thinking either your monitor or your graphics card couldn't support that high of a resolution. Either way you need to edit your /etc/X11/XF86Config file. Pop in RH 8.0 CD 1, reboot, and get to a console. Open XF68Config and scroll down to Subsection "Display" Take out the "1152x768" line, and any higher resolution lines. Save, reboot, and cross your fingers.
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