Installing Nvidia Video Drivers
To install the video drivers from source you'll have to download the kernel headers, or install a custom kernel. See secion Installing Custom kernel.
To do this process I'm creating a directory in mythtv's home directory (/home/mythtv) called nvidia, then going into that directory and downloading the nvidia drivers with the wget command. Then I switch to mode 3, and perform the installation of the driver.
This process involves the creation of a kernel module, meaning that everytime the kernel version changes (when doing a #yum update), you'll have to do it again.
Once the module is built, switch back to run mode 5.
These are the commands to perform all that:
#init 3 (enter root username and password)
Now you can save your /etc/X11/xorg.conf and download my working xorg.conf. In case it doesn't work for you, you can always return to your previous xorf.conf or try the graphic configuration (see below).
#cp -p xorg.conf xorg.conf.orig
To go back to praphics mode do:
Once you are back in KDE, you can configure your graphics adapter by going to:
System->NVIDIA X Server Settings