I noticed something that was irritating me this morning. The screen would go black after I chose to install CentOS 7 on VirtualBox. What you can do is choose Troubleshooting in the startup of the installer. Then choose Basic graphical install, this seems to get around the problem.
Hope this helps somebody!
Refactoring Self 
Exactly what I needed. Searched for an hour for a solution and this worked perfect. Thanks.