Look at the pages on this link. It is a page by page, picture by picture guide that shows how to do a dpkg-reconfigure xserver-xorg. I know you don't need this info but the first few pictures from the guide will help you. The first few pages deals with going from a gui log in to a console type log in. You just need to follow the guide, doing the reverse of what it says to do, so instead of changing a 5 to a 3 you will be changing a 3 to a 5. It's pretty simple.
http://www.mepisguides.com/Mepis-6/n...idia-dpkg.html