/etc/xorg.conf

As root, open that in a text editor like Emacs or Vim, and look for the resolution portion. Been a while for me asI haven't installed an OS in almost a month so I'm not positive what part of it it was I edited.

Another thing you could do:

/etc/inittab

Open that up and switch the default run level from 5 to 3 and run Sax2