Resolution locked at 640x480

I have installed Slackware 10.0 on a Pentium II 350 box with an 8mb S3 Trio3D graphics card, with a 15" IBM Aptiva monitor. However, I cannot change the resolution past 640x480, which makes a lot of things in KDE or Gnome difficult to do. (Like clicking APPLY because it is off the screen) I am quite new to Linux in general, but I have tried using xrandr and it tells me my only available resolution is still 640x480@85hz. I'd like to get 1024x768, or at the very least 800x600, and I know there must be away, because I've certainly attained these resolutions through Windows on this monitor and graphics card. Additionally, I can't run Xconfigurator. The command is not found. Any ideas?
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Press Ctrl+Alt+<plus sign on numeric keypad> to cycle through the different resolutions  configured on your system. In case you are not able to do so, you can edit the following file:
# vi /etc/X11/xorg.conf
This should contain the resolutions under the Section "Screen". You can search for 640x480.

Change 640x480 to 800x600 640x480

Save the file and restart your system.

Prior to editing above, please copy xorg.conf to xorg.conf.backup. Later on, in case of any problems, you can restore back your earlier configuration file.

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Tabris42Author Commented:
The screen setup in xorg.conf gave me listings of 4 display types, 8, 16, 24, 32 (colour depths) and and said "1024x768", "800x600", and "640x480" next to each of them. I am apparently using depth 24, so I thought I'd edit out the 640x480, but that fixed nothing. There is no other mention of screen resolution in xorg.conf.
Tabris42Author Commented:
Lowered it to depth 16, and that let me go 1024x768. Guess I had to sacrifice colour for resolution, but I can live with that.
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