"Now after logging in (as root)"..I typed in...sudo gedit /etc/X11/xorgconfig....Is that correct?
xorgconfig is a program.
You are getting the error message ( (gedit:7192): Gtk-WARNING **: cannot open display: ) because gedit it a graphical text editor. When it runs it needs X to be running which, of course (!), it isn't.
If you had managed to run gedit one of three things would have happened: either it would have complained that xorgconfig is an executable (program), or it would have warned you that it isn't a text file, or it would have opened the file and you would have seen a load of gibberish
Anyway, this is all academic.
Take a look at http://www.slackware.com/config/x.php
It gives a nice intro to X, and suggests that you might like to start by trying xorgsetup (also a program). Then, if that doesn't work, try xorgconfig.
Read the man (manual) pages for xorgsetup and xorgconfig before using them:
Setting up X on hardware that doesn't want to play nicely can be tricky. You'll need to be patient and methodical (make paper notes as you go). And preferably have a good 8 hours of sleep first