[expert] Need to stop X from starting at boot.

[james.fogg]

I screwed up my x-windows configuration and now when X boots it locks up
(video driver experiments.. ooops).

My problem now is that I cannot change my settings from X (cause it wont
run) and yet it runs X on boot. I see the penguin and a command line login
for about 2 seconds then X server starts.

How can I stop X from starting when I see the login?