your link for some reason didn't solve the problem but it showed
me how to overwrite the xorg.conf file which had me stumped.

What I did do was copy the monitor paragraphs that referred to the
monitor from a Kubuntu 7.04 Live CD bootup. After that, I had to
beboot and set the screen res from 800 to 1024 which was now
available. Here are the paragraphs I replaced:

# Section "Device"
# Identifier "Configured Video Device"
# EndSection
#
# Section "Monitor"
# Identifier "Configured Monitor"
# EndSection
#
# Section "Screen"
# Identifier "Default Screen"
# Monitor "Configured Monitor"
# Device "Configured Video Device"
# EndSection

Section "Device"
Identifier "Trident Microsystems CyberBlade/XP"
Driver "trident"
BusID "PCI:1:0:0"
EndSection

Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 28-51
VertRefresh 43-60
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Trident Microsystems CyberBlade/XP"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768"
EndSubSection
EndSection