Super user problem FC10

[Croombe F. Pensom]

I have installed FC10 five times now but I can NEVER log in as root as
it ALWAYS tells me that the authentication failed.
I did the install very, very carefully as I thought that, maybe, I had
goofed; but, no, I set up root password OK but still cannot do the login
as root.
The only way I can get to root operations is via sudo but, then, I can't
get a gui running (I'm a bit lazy!!).
Any ideas as to why I can't log in as root?
CroombeFP
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