I have a Geforce FX 5200. I had to install RH9.0 in text mode. Now when I boot linux the screen turns off!! I read every where and so far I figured out that I need to install new drivers(NVIDIA-Linux-x86-1.0-4496-pkg2.run). I burnt the file to cd. So what do I need to do now to install it on rh9.0. I need lets of detail since I am a newbie.
P.S My boot loader is grub.

copy it to a folder, then run "sh NVIDIA-Linux-x86-1.0-4496-pkg2.run" as root.
you could become root by "su -", passwd.
actually you don't even have to burn it to a cd.

where do I type those commands at?

You're going to want to boot up into text mode, rather than graphic mode (since you're getting the whole "screen turns off" problem) Since you're using GRUB scroll down to the option to select Linux, as you normally would. But, instead of hitting [ENTER], hit [e]. At the prompt hit [3] and then hit [ENTER]. Now, hit [b] to boot as you normally would, although this time, instead of getting the usual "Hey my screen's not working" you'll get something like this
login:
If you enter your username and then your password, you'll be on your computer, just in text mode (Or runlevel 3). So, this is where you would enter the commands as tricky_linux has told you. Hope that clears things up!