You're going to need the nVidia drivers for your card available here
most people stand by the 4496 drivers as they seem to have the best compatibility. So since you can't use the graphical interface you're going to have to do it through the Command Line. Don't worry I'll walk you through it.
Step One: Booting into the CLI instead of X
I'm assuming you are using GRUB (I think that's the default boot loader for Red Hat, that's what I used anyway) so when you get to your GRUB boot menu, follow these instructions, I found them on the Red Hat website
If you are using GRUB as your boot loader, you can fix the inittab file with the following steps.
In the graphical GRUB boot loader screen, select the Red Hat Linux boot label and press [e] to edit it.
Arrow down to the kernel line and press [e] to edit it.
At the prompt, type 3 and press [Enter].
You will be returned to the GRUB screen with the kernel information. Press the [b] key to boot the system into the command line interface.
This won't have any problems starting X since it doesn't need to use the card. Everything should boot up find and you will be presented with the
screen. Login as you normall would and su yourself to root.
Step Two: Installing the nVidia drivers
Now what you're going to want to do, (as root) is go to wherever you downloaded the nVidia driver and run this command
$ sh NVIDIA-Linux-x86-1.0-4496-pkg2.run
This will give you a menu, chances are you're going to have build your own Kernel, which, if you don't have the sources could be a problem. Doing
$ uname -r
Will give you your Kernel version, you will then have to find the Kernel sources online and download them. Just search google for Red Hat Kernel Source <version number>. You'll get an rpm file that will install the sources so you'll be ready to go. If you already have the sources installed or nVidia can find a custom kernel whatever on their FTP, then you don't need to do this step. I had to do it, so I'll assume you will. After you have the sources and you've build the kernel module for your graphics card, you're almost there! All you need to do is edit your XF86Config file and you should be ready to go. First you'll want to make a copy of your Config then open up your XF86Config file with vim, by typing this in the CL
$ cp /etc/X11/XF86Config /etc/X11/XF86Config.old
$ vim /etc/X11/XF86Config
This will present you with your current Config file, what you're going to need to do is change the following things (this is copied from the nVidia installer readme)
If you already have an XF86Config file working with a different driver
(such as the 'nv' or 'vesa' driver), then all you need to do is find
the relevant Device section and replace the line:
(or Driver "vesa")
In the Module section, make sure you have:
You should also remove the following lines:
if they exist.
After you do this save your config and try doing startx. Everything should run fine and you should be up in business! Also, if you haven't used vi before you're going to want to skim through this
so you don't mess anything up. The most important things are hitting 'i' changes it into INPUT mode, where whatever you type, appears on the screen. Hitting ESC will bring you back into Command Mode, where you would normally Quit, Save etc. After you make all your editing, go back into Command Mode and do SHIFT+ZZ. This will save and close the current document. Hope everything works out for ya!