alejo@green:~$ sudo Xorg -configure
(EE)
Fatal server error:
(EE) Server is already active for display 0
	If this server is no longer running, remove /tmp/.X0-lock
	and start again.
(EE)
(EE)
Please consult the The X.Org Foundation support
	 at http://wiki.x.org
 for help.
(EE)