I did the full install; it's what I've been trying to fix.
There was no opportunity to select/check a desktop environment during the installation.
(I ran through the first part of the process again just to be sure.)
During the process I saw a brief note that there wasn't enough memory for a graphical installer.
I found the answer on http://www.sysads.co.uk/2014/01/inst...ui-centos-6-5/
Edit /etc/inittab and change id:3:initdefault to id:5:initdefault (3 to 5)