Quite similar to Cannot Display This Video Mode? which seems to have never been answered.
Display works fine in liveCD but not in full installation.
Full install boot I get the bios splash and then the screen goes black and screen resolution error message.
If I try holding shift for grub, I get the bios splash, "loading grub", then screen resolution error message.
Ctrl+Alt+F1 does nothing.
Attempted to modify /etc/default/grub, changes are overwritten to defaults.
sudo lshw -C display reveals I have a Rage 128 Pro agp card.
System reboots if I press Ctrl+alt+del.