YUCK! Hopefully you will have someadministrator account or backdoor you can use to get in an reset the password. I had a similar issue (though with an older 5.1 server)and Novell's engineers spent three days onsite (from Texas) and ended up replacing half the system files one by one, before running the DAT Backup to restore the entire volume.
SO hopefully, you can admin in and clear/reset the user account.
OH YES, and as ALWAYS with just about any little problem in Novell, run DSREPAIR, but I assume you would have done that first,