@TG01 Just for process of elimination, put the office cable on Port 2 since you know it works, and move home Wi-Fi to port 3. That will either confirm or eliminate port 3 as the issue. If the issue follows the cable to port 2 then its likely some kind of configuration problem. What is connected at the other end of the office cable, another router or switch?

  @RickJamesBish  thanks for message. The problem is not a port problem. Have used different ports and result is same. What I am trying now is switch connected to router, ethernet in any port connected to laptop. That works good. Then when add my home wi fi booster to any port on switch the result is then that home wi fi works good but ethernet to laptop reads unidentified network  - no Internet.

  @TG01 You really need a diagram when throwing around router, switch , booster, ports, etc. For example your booster. What is it exactly? Does it handle DHCP?  Post brand and model.  It eliminates a lot of confusion. There is a free one located at Visual Paradigm Online.

So you are saying it works with the top configuration but when you add the "booster" your laptop no longer works? If so there is probably a configuration conflict being caused by the booster.