[Centos] problem with 4 RC1

Has anyone else had this problem?

On my laptop, I am currently running 3.4, no problems (runs really 
fast). When I formatted and upgraded to 4.0, it made it until the end, 
then locked up at the "preparing for first boot".....

Eventually I had to cold reboot, and it wouldn't load the kernel at 
subsequent boots. Back to 3.4 and working fine. I burned another set of 
CDs thinking it was bad media, but with the same results.

Any ideas if this is a bug?