If you still have the root password it won't be that difficult to perform a PASSWD command, otherwise you may try and access the disk from external source and then hope that JohnTheRipper or similar tools can find the password.

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Boot the system from the SUSE media in rescue mode. You could also use Knoppix or a Centos LiveCD. Mount your root partition on /mnt. Edit /mnt/etc/shadow and remove the root password (the long string of random-looking characters between the frist colon and the second colon). Remove the rescue media and reboot. Log in as root. The root user now has no password - just hit <ENTER> when prompted when you login. Use the "passwd" command to set the root password and to set any other passwords you like.

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