Need help with Ethernet card

I have OptiPlex 9010 Dell with onboard ethernet connector. I have a Belkin router f80.
I have internet provider with dish on roof and cable thru wall connected to router and cable from ethernet onboard computer to router.
I can wifi off of router with laptop in another room. But I cannot get desktop online. It says ethernet not connected. I have tried uninstalling it and restarting computer and no change. I have changed cables and
still the same problem.

I have no clue what is up with this as it has worked fine in the past with same hookup.

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I have changed cables and still the same problem.

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Did you try a different port on the router also? I don't see a Belkin F80 listed. Is that the right model number?