The cable for Built-in Ethernet is not plugged in

Hi this is my 1st time on this discussion forum and I'd appreciate it if I could get some help to resolve this issue. The problem began with another fault ‘Your network settings have been changed by another app' but I solved this with a solution from this forum. My computer was working fine before this.
With this second issue, I have tried everything to fix it but without success. The network settings are correct. The cable is fine as it works on another computer. I have used another cable as well. The light on hub shows it is connected. I have tried plugging it directly into the router and many more. The problem is definitely software and possibly from an update. Please help as I have search the internet for days to find a solution.

Hello Yabbynz, and a warm welcome to the forums!
For a start, type this into the bowser's URL bar...
17.254.3.183
If that gets you to apple.com, then try putting these numbers in Network>TCP/IP>DNS Servers for the Interface you're using...
208.67.222.222
208.67.220.220
Then Apply. These are safer/faster than most ISP's DNS numbers, and have been patched against DNS poisoning.
https://www.opendns.com/homenetwork/start/device/apple-osx-tiger
If not, report back.

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