Ethernet port not working. Please help!

I’ve been getting the internet on my desktop through an external USB WIFI recever for the past few months. Its not great but I knew it was temperary. Now that we’ve rearanged some things, I can finaly run an eathernet cable directly to my desktop. However when I plug it in nothing happens. The computer dosent recognise that anything is there. The light night next to the port is on indicating that its getting a signal and the router says its sending a signal out. If its a driver issue I cant seem to find the drivers to install. Im running windows 7 and my computer is self built. Motherboard is a GIGABYTE GA-Z170-HD3P. Please Help!

I didn’t find the right solution from the Internet.
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