Weird issue with onboard Ethernet port

[chippernostalgia]

My motherboard, which is now roughly 3 years old, has two integrated LAN ports on the back. Around a year, year and a half ago, one of them stopped working (completely random from what I can remember). The other worked fine and I put it down to a drive issue and never really paid much attention to it as I was only using one anyway.

Fast forward to today, after a doing some upgrading and changing out case and installing W10, the issue is still present. The old OS was windows 7.

I'm leaning towards the port just being broke, but I figured I'd seek some information incase someone else had something like this.

So - the lights on the port work when cable is attached. The OS picks up a cable is attached and tries to identify network, but is never able to get an IP, and thus it says "Unknown Network, no Internet".

The port just below this one works completely fine.

Since this issue spans different drivers, different OS's, changing cases, etc. I'm leaning toward it being FUBAR'd from a hardware perspective, but I'm unsure what would even cause that. If it was a power issue I'd expect the port to have no power at all, but it does.

 

[Ralston18]

Will agree that the upper Ethernet port is most likely the issue.

The light is simply an indicator that a connection is detected and not so much that the connection is working or workable.

Those ports a subject to damage via plugging and unplugging. Especially if the plug is tight and/or locks in very tightly. Only takes a small crack or break in the solder joints to cause problems.

Someone just tripping on the connected Ethernet cable can yank out the plug. If the plug does not come out the force may twist and/or pull the port.

What make and model motherboard? The port may be a known problem. There may be some "fix" if the problem is not physical.

Overall, damaged port is a good bet.

 

[camieabz]

Run ipconfig/all with and without the cable connected, and compare the differences (if any).

Also consider - https://en.wikipedia.org/wiki/Ipconfig#Forced_release_and_renew (if using DHCP).