Recently, my Windows laptop started becoming unstable at school, and crashed at alot of times that I needed it. It was running XP at 800x600, 24bit. It has a Pentium 1 processor, and a Trident video card. It's very old, with a Pentium 1 200mhz and 80mb ram. Was orriginally intended for DOS. Anyhoo, I installed Slackware 9.1 on it and now I have problems starting X. I let X auto-configure the XF86Config, and it did mostly properly. But it only starts with a resolution of 640x480. When I attempt to add a line to force the display to 800x600 it returns the following error. "(EE) Virtual Height (0) is to small for hardware. (min 1)". I know this card can do 800x600. Please help.

Here is a link that will explain how to set this up. Make sure you get the horizontal and vertical sync frequencies right on your monitor.

http://slackware.com/book/index.php?source=c1364.html

SuperProbe did not work for me, but I used xf86config and it worked fine.
You get to choose what resolutions you want for your monitor. You can change the resolution by hitting ctrl-alt and the + or - sign.

Good Luck