I'm facing the exact same issue.
The machine is great, everything installed and running
Just the NIC card problem
It is able to detect and identify the NICs installed, but is not using either of them to get an IP
probably because the are not "compatible" ? although recognized and identified by the server?
One is a build in Realtek Giga LAN
and the other is another generic NIC
I'm trying to get some old 3Com and Intel NIC on it, to see if it works with those.
I just find it ironic, that it knows what is installed, but it wont use them?