Mike, go to one of the TTYs (CTRL-ALT-F6), login, and try restarting the GDM:

sudo /etc/init.d/gdm stop

then

sudo /etc/init.d/gdm start

Then switch back to the GUI console (CTRL-ALT-F7) and see if the GDM
will accept an ID after restarting. It might automatically take you to
the GDM after it restarts, I can't remember.

-- 
Brian D. Ropers-Huilman
612.234.7778
Sent from Lancaster, Wisconsin, United States