We finally got it working. It was the XVR-500 video card that wouldn't let Openwin start. Taking it out and jumpstarting it worked. Then we put the card back in and added the packages for it...
I double (triple/quadruple) checked the hosts & sysidcfg files created by the add_install_client. I also checked the NIS+ ethers.org_dir file and the Mac/Ethernet addtess is good.
We had to replace a hard drive in one of our Sun Blade 150s, but now it hangs during the Jumpstart. It will show 1 or 2 Timeout for ARP/RARP messages and then start the spinning numbers. It always...