Sorry for jumping the gun, but I found the answer myself.
I guess I should have exhausted all avenues before asking a dumb question.
Like my friend Larry used to ask me, "Can I ask you a dumb question?"
I'd reply, "Better than anyone I know!"
Here is the solution:
Using vi, or whatever editor you like, edit file /etc/inittab and change the following entry:
This will change your default run level from 5 (which is graphical) to 3 (which is text mode, non-graphical).
Then when you reboot you'll be in text mode. To start X Windows type in startx.
Thank you for allowing me my moment of impatience.