New PC cant connect

So I built a new pc.... after I got everything together, I installed Windows 10. I am using a netgear wifi extender as a port for my ethernet cable. Sadly, my new pc doesnt recognize that there is an ethernet cable plugged in. it gives a message saying "not connected" "no connections available", "network cable unplugged". And yes I installed all the Mother board drivers. Any ideas?
 
I don't exactly get what you have set up.

My strategy would be to simply plug the computer straight into the router coming into your home, and get that set up. Then monkey around with this extender.
 
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