[CentOS] Non-gnome desktops on CentOS-7

Is there a writeup somewhere detailing how one installs a non-gnome desktop? I have installed both KDE and Mate and both fail with the same error. (EE) no screens found.

I am a bit bewildered that neither the official KDE from centos nor the semi-official mate from epel pull in as part of their install the Xserver. I am also bothered by the fact that installing a desktop other than gnome 3 does not in fact provide one that can be started from the command line.

I am not trying anything complicated here. I just want to install a working desktop that is not gnome. Is this possible on CentOS7?