[CentOS] Laptop non-graphic install init 5 to X not Gnome

Well I got my 1st notebook install done.

Since the video card takes 24Mb memory, installer would not go graphical 
(256-24=232).  But I can now boot into character mode.

an init 5 brings up X, but I am in the X environment, and I want to be 
in Gnome.

What file am I to edit and what changes do I make?

thanks.