kickstart not used in the boot process

["gerard labadie" <gerard labadie gmail com>]

Hello

Intel PowerEdge 2650, Red Hat ES 4 update 4

I have created a ks.cfg with system-config-kickstart, and copied "my" packages in a temp directory
I have copied it in the top level directory and in the isolinux directory
I have chmod u+w isolinux/*

I have created a .iso file, according to
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Installation_Guide-en-US/ch02s04.html
Then burn it.
I can read the CD fine.

When I boot, the ks.cfg file is ignored, as I am asked the language and all the usual questions.

Any idea what I am doing wrong ?

Thanks for any hint.