Looking at mine now and it is connected but the net light is the only one out. Do you have a laptop you can work with?
If so, set up the NIC on your laptop (or PC) to be static IP 192.168.1.100, subnet 255.255.255.0 and connect a cable directly from your NIC to the NVR NIC. (your NIC should auto configure as a crossover, if it's old and doesn't you'll need a switch in between the PC and the NVR)
Ping 192.168.1.108 and see if you get a reply. If you do, browse to that address and change the NVR IP to DHCP or set it to a static address consistent with your network.