Reset root password!!
1. Boot in single user mode
2. Just wait a minute
3. Enter full pathname of shell or RETURN for /bin/sh: [press ENTER]
4. Mount the file system
#mount -t ufs -a
5. Change the root password
# passwd
New password:_
Retype new password:_
passwd: updating the database...
passwd: done
# exit
6. Back to multiuser mode
It's DONE!!