I'd try another Ethernet card.
..of. I have another computer on this router that works just fine. I have check all connections, unistalled and reinstalled drivers, tested different ethernet cables. Ran a virus scan. When I diagnose and repair, it says "A cable is not plugged into the network adapter "Local Area Connection", but it is plugged in. There is NO light where you plug the cable in. The router does not recognize anything coming from this computer. Any ideas or things I could try?