Did you enable gpm? If not then
chmod +x /etc/rc.d/rc.gpm
will do that for you. This will let you see if your mouse is working even at the CLI. Just log in and shake that baby, you will see a block floating around if it is. Lets start there before you get into setting up X. If you mouse doesn't work from the Command Line then you will want to re-run that part of the setup script. do
and pick Setup and then mouse to do this. and try a different device.
If everything runs well in the CLI then you should run
to get x set up check out the slackbook