I've never gotten PXE to wprk right in my lab.

I recommend all nodes boot a CD or all nodes be hdinstalled. I've recently had more success with a CD only distro (no hdinstall option) that runs on a 200MB CD and, as a rexult, boots about as fast as hdinstall. This distro in BCCD (Bootable Cluster CD) which also uses openMOSIX. Maybe you sould try it!

Regards,
AJG