On console or KDE/Gnome?
To change the console setting, edit the 'vga=' setting in /boot/grub/menu.lst according to this table:
Code:
| 640x480 800x600 1024x768 1280x1024
----+-------------------------------------
256 | 0x301 0x303 0x305 0x307
32k | 0x310 0x313 0x316 0x319
64k | 0x311 0x314 0x317 0x31A
16M | 0x312 0x315 0x318 0x31B
It might be that the 2.4 kernel of SUSE 8.0 requires decimal values instead of hexadecimal. In this case, e.g. 0x317 becomes 791.
For the graphical system, you can try the command 'xf86cfg'. I think I remember this was a tool for non-graphical configuartion in older SUSE versions.
Good luck!