fedora 17 after updates, no longer get login screen

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http://forums.fedoraforum.org – Hi everyone I'm not having much luck with fedora 17. Its going from bad to worse. systemsettings phonon stopped working for me (crashed). It looked to me like a gstreamer backend dll problem, so in desperation I decided to do an upgrade...which took a very long time to complete. Anyway the system will no longer give me a login, it just sits there with the fedora logo in the middle of the screen. I am beginning to resign myself to having to start again (i.e. re-install from scratch). But I really dont want to do that just yet, it will probably take me a week to set things up the wa (HowTos)