I'm getting the same issue. Did you ever resolve this?
That was a long time ago, but yes, I did resolve it. If I recall correctly, I simply had the wrong video driver, and resolved this by using a generic driver after including livna in my yum repository list.
Your path forward thus requires researching alternative video drivers for your installation.
PS. I had no similar issues after I upgraded from Core 7 to Core 8. I'm at Core 12 now, and have never had a similar installation problem, even though I installed Core 8, Core 9, and Core 12 from scratch (not using the upgrade path, but installing as if new.) Apparently whatever was wrong in the Core 7 installation was fixed thereafter.