So I have an array of machines that are on the network, most are identical HP machines. Have existing FOG server that some machines can PXE boot to and some cannot. Those that cannot, get the PXE-E51 error, No DHCP or proxyDHCP offers were received. I have gone through all the BIOS settings on the machines, and actually exported and imported from a working machine and still cannot PXE boot. Any idea on where to start troubleshooting?