Fedora 18 fails to login

view story

http://forums.fedoraforum.org – Hi, It is about several months I am working with fedora 18 on my DELL E6510 with Gnome 3, but today after I reboot my system, the "f" symbol of fedora 18 shows up and it fills out but I am not redirected to the login page!!!! Also everything is just halted until I press ctrl+alt+F3 to get to the command line env. What shall I do to get everything back? (HowTos)