X doesn't start anymore after installing Nvidia drivers. :(

Hello there,

I tried to install the latest nvidia drivers before installing the Cuda toolkit and get busy programming.
I wanted to use Linux, but I got disappointed another time… due to my inexperience… of course.

Anyway, I have a GT 420M on an Acer laptop running Fedora 14. I was able to install the drivers with no problems in console mode.
But then, as soon as I wanted to swtich back to X, the server doesn’t start. All I see is a black screen, computer freezes and I have to shut it down manually.

Any clues?