zen dhcp

I have zen imaging setup on a couple of our servers and yesterday our tech was able to clone 3 or 4 computers successfully pulling image from netware server with manual boot on a zen cd. However it stopped working and now displays this message DHCP not configured and won't assign an ip address to the computers anymore. I've restarted dhcp services and even the server and still get the same message. Not sure what else to check?

Thanks
aron