Can't login to root

From: Wandering Destiny (remove_starcrushed_at_hotmail.com)
Date: 01/29/05 

Date: Sun, 30 Jan 2005 02:15:35 +0800

A colleague of mine manually edited the shadow file to enable password
expiration. Some how, he messed up the shadow file and now we can't log in
or su to root, not even from console. I know he didn't changed the password
field of the file, so could he have changed that caused root not being able
to login even at console? If I do a reboot to single user mode, will I be
able to login as root?

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