[CentOS] [CentOS 6] what really starts x11

>
> actually i tried that. it does start.
> it just doesnt start automatically.
> i can start it manually 
> jerry
>

One centos 6
I found /etc/init/prefdm.conf

In it there is "exec /etc/X11/prefdm -nodaemon"

When I run this by hand all it does is log me out - no X windows 
starting up.
This is what is not happening.

X is not starting on reboot. /etc/inittab has runlevel 5.
Thoughts?

Jerry