root account has been locked

I'am set the root account locked ON, using smitty, so I can't login or su with root user in my AIX system, some one can help me to unlock root account login ???,
sample :
:~>su
root's Password:
3004-301 Your account has been locked; please see the system administrator.
3004-501 Cannot su to "root" : No permission.

Thanks.

have you tried booting from teh installation media and mounting the root partition then correcting the problem?

this has never happened to me, but then again i am still learning AIX.