I am not able to log in

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http://forums.fedoraforum.org – I installed fedora a few hours ago. But when I rebooted (for the first time) and tried logging in, the computer freezes for a second, shows a blank black screen and then returns me to the login menu. I can, however, login when I choose recovery mode from grub. I even tried changing the password, making another user which all worked while I was in recovery mode but I still can't log in when booting as normal. The new user account that I created is shown on the menu but when I try logging in through it I am again returned to the login menu. I use Fedora 17 x64 LXDE. I also tried Code: (HowTos)