[CentOS] Radeon graphics problems with CentOS 6.6

I'm still struggling with this.  I was hoping to boot a centos 6.6
livecd to see if this is specific to my installation or a general
problem with my hardware.  I can't find a 6.6 livecd on any of the
several mirrors I've checked or on the centos vault.  Does anyone know
if one is available somewhere.  Other ideas are welcome too.