I just got my Nvidia graphics card up and running. Here is how I did it all.
apt-get install kernel-headers-`uname -r`
Second: I used synaptic to install the kernel source for sarge(I could not get it installed with apt-get)
tar -jxvf kernel-source-2.4.x.x.tar.bz2
ln -s /usr/src/kernel-source-2.4.x.x 2.4.x. ( I think mine was 2.4.27)
apt-get install nvidia-glx
Fifth: Downloaded Nvidia Driver from Here
chmod 755 Nvidia-linux-x86-1.0-8762-pkg1.run
That should get the nvidia driver that supports 3d acceleration going. Now to change your Screen Settings.
Locate the Section that says Screen. Then Check the Default Depth. What ever that setting is locate the corresponding entry and press i to insert. now just type in the following
Your line should now say something like this.
"1280x1024" "1024x768" "800x600" "640x480"
press esc then hit :wq to write and quit Then reboot and you should be up and going.