If the GRUB prompt is coming up with no menu, it means that GRUB can't find the menu script at /boot/menu.lst. You could get a boot disk and try to create the script yourself with a text editor (details of how can be found at http://www.gnu.org/software/grub/manual/grub.html
) or you could try my heavy handed approach and do a complete reinstall (I do it without formatting, but since you're on a clean install there's no harm in formatting either). If you didn't notice, SuSE 9.1's installer does allow easy modification of the GRUB config. By default it has just linux and failsafe, it could be that you deleted that by accident during installation. Leave them there if you reinstall and see how that works.