I had the same problem
do this... got this from this group earlier and it worked for me
su - root
password: <whatever it is>
vi /etc/pam.d (or use your favorite editor)
look for a line that has:
user != root (or something like that)
comment out the line, or delete it...
save the file, log out, log back in, end you should be able to access as
> Date: Fri, 5 Dec 2008 03:20:02 -0700
> From: mike azdwiggins com
> To: fedora-list redhat com
> Subject: root in FC 10
> I upgraded a throw away test system from FC 8 to FC 10. When it
> finished, I tried logging in as root user and could not.
> Logging in as a normal user I went to a text session and the su command
> worked with the old root password.
> Did I do something wrong or is this something new to 10?
> Thanks in advance
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