I had this problem. I don't know what card you have, but you probably need to remove kmod-nvidia and install kmod-nvidia-96xx. The new Nvidia drivers have stopped supporting GeForce 2, 3, or 4 cards, and the kmod-nvidia-96xx package contains the drivers that do support them.
yum remove kmod-nvidia xorg-x11-drv-nvidia
yum install kmod-nvidia-96xx xorg-x11-drv-nvidia-96xx
See this article: http://forum.fedoraforum.org/forum/s...highlight=96xx