[Centos] PXE boot Centos 4.0beta problems

Has anyone yet tried PXE booting the vmlinuz/initrd.img 
set from Centos 4.0beta2?

I have a pxelinux setup that is booting 3.4 PXE images 
fine, but the equivalent setup for 4.0beta loads the 
kernel and then splashes the monitor full of multicolor 
random characters.  Not a good start to an install...

Anyone had luck?  Any changes for PXE boots known for 4.0?
Thanks in advance.
-Alan