[CentOS] kernel panic at install time centos-3.5-x86_64

I have successfully kickstarted 3.4 x86_64, but after updating my repo to 
3.5 I see a kernel panic when it loads vmlinuz.

Funny thing is that I had one box that would kernel panic while trying to 
install centos-3.4-x86_64, which then would install fine after updating to 
3.5, but now my other mahcines will not kickstart.

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