Upgrade to F12 problem

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http://forums.fedoraforum.org – Hello... I decided to update F11 to F12 from the .iso and the upgrade process went smoothly and finished correctly, then at the end I restarted the computer as prompted by the installation tool... Once it restarted the GRUB screen appeared correctly listing my available OS, the new Fedora 12 (Default) and Windows XP, so I selected Fedora 12... The startup progress bars started to fill, the dark blue one, then the light blue one and finally the white one, but to my surprise here's where it all failed, as soon as the progress bars complete, I get nothing but a blank screen with a cursor... I can write whatever I want and nothing happens is just a blank screen with a cursor and that's it... The funny thing is if I press Ctrl + Alt + Del then I see the usual shutdown process (the one listing the closed processes with a green OK) and the computer restarts... I really have no idea what went wrong, could it be the nVidia drivers that I installed in F11 and now don't work on F12 and can't load gnome? I could really use some help as I'm totally clueless about this, help in advance and cheers! (HowTos)