[CentOS] custom kernel cant find label /

Wed Jun 18 15:47:54 UTC 2008
Jerry Geis <geisj at pagestation.com>

Hi all,

I installed centos 4.6 on a USB thumbdrive.
It installed and booted after install.

I then put a custom kernel on, build it as I should,
on rebooting and selecting my kernel to load from grub I it starts up 
and all
and the last error I get is:

label / not found.

What went wrong?

Jerry