[OSX][Lion] Reset Root password

reset_root_password_osx_lion

All you have to do is turn on your computer holding CMD + S. This will boot your Mac in Single-User Mode. Next, you have to wait a second while kernel will load command-line interface. It there is :/ root# line, you’re ready to go!

OSX Lion
First of all, type

# /sbin/fsck -fy
This will take a while. It will check the consistency of your filesystem. If there is no error, your output should be similar to this:

** /dev/rdisk0s2
** Root file system
   Executing fsck_hfs (version diskdev_cdms-491.6~1).
** Checking Journaled HFS Plus volume.
** Ckeching extents overflow file.
** Checking catalog file.
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking extended attributes file.
** Checking multi-linked directories.
** Checking volume bitmap.
** Checking volume information.
** The volume Macintosh HD appears to be OK.
:/ root#
The last three steps are very quick:

# /sbin/mount -uw /
# launchctl load /System/Library/LaunchDaemons/com.apple.opendirectoryd.plist
# passwd root
Bash will ask you for the new password for your root account. Type, retype and done! You can now safely type

# exit
and your Mac will display the Login Screen.