four blades, they are all connected via virtual connect, all have the same networking applied, and all are on a distributed switch.
and the majority of the production servers (including the PXE boot, DHCP, provisioning, etc, are all connected to the same single vlan, which routes between blades on the virtual connect)
also, the single host that it was successfully DHCP/PXE from is a differnt host than the DHCp server and PXE servers are hosted on.