So You need to rescue GRUB,try the suse first cd,it have the option to reinstall GRUB.otherwise u need to mount the partn using the cd,chrooted into the partn containing root /[which u can find by "fdisk -l"].after rescuing GRUB,reboot and press 'e' in the suse menu and select the 2nd line ie;the kernel path line and press 'e'.now at the end of the kernel line type 'single' and press enter.now press 'b' to boot into single user mode and type
Code:
cosmic:~# passwd root
give the password and exit for normal startup...Best of LUX