How to restart gdm in Fedora 12

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http://forums.fedoraforum.org – Hi I installed GNOME shell and now I can't login after restarting the computer. It brings up the login screen and I can enter my password, but it just goes back to the login screen. I would like to stop GDM and run X -config to see if that straightens out the problem. Suggestions welcome. Thanks in advance (HowTos)