how to customize your own red hat installation CD
 

I created my own ISO by removing out Cluster/ClusterStorage/VT and some rpms under the Server sudirectory in the original Red Hat Enterprise Linux Server 5.8 Installation ISO, my iso can boot, and after language and keyboard selecting, it prompts "NO CD Found".

So the question is what cause the problem, and if I missed some works needed? Thanks a lot in advance.

Just to verify you are not redistributing this software and you have a license.

You could try this http://www.virer.net/info/custom-dvd/.
As above, if you are thinking of externally distributing this, you can't use RHEL, use Centos instead.

Are you installing on a real machine or a virtual machine? If a VM try pointing the CDROM to an ISO file, and not physical media.