Mac Pro won't recognize ethernet connection

My Mac Pro won't recognize the Ethernet cable when it's plugged in. I know the cable and connection are good because my MacBook Pro recognizes it with no problem. I've had it for around a year, but have always used the airport to connect to the internet. It has two Ethernet ports on the back and I've tried both. Is there anything I need to do to configure the NIC card?
Thanks in advance!
Ryan

No, but you do need to configure the Ethernet port in Network preferences. Open Network preferences and select the Ethernet port. Click on the Advanced button then on the TCP/IP tab. Set the Configure IPv4 drop down menu to DHCP. Set the Configure IPv6 drop down menu to Off. Click on the Apply button. If all is well you should see a valid IP address in the network settings for the port. If you see an IP address starting with 169., then it means your Ethernet port is not getting an IP address from your router. You should have an Ethernet cable connected from the Ethernet port on the computer to one of the LAN ports on your router.

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Mac Pro won't recognize ethernet connection

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