Network cable was removed although it works on the laptop what is it?

We're currently rebuilding and my dad has installed a lan connection in my room. And today I wanted to connect my computer to lan connection and then came the message network cable was removed although the LAN port on the laptop worked with all lan cables we had only on my computer not I hope you can help me

Fairly confused, I assume that the laptop has Wi-Fi and your computer is not.

Hmm, I do not want Wi-Fi I want to use my computer with a LAN cable!

Well, then he probably connected the LAN wrong.

No, he does not have it otherwise it would not work on the laptop

If there's Wi-Fi in the house, and your laptop has Wi-Fi, and you do not connect a working LAN, your laptop will continue to run on Wi-Fi, then turn off the Wi-Fi in the laptop and try your LAN again.

LAN line checked. Are all 8 lines switched?

For 10 euro get a network line tester.

Is the line on the other side patched to the router?

So I have a Smart TV since Sunday and the other Lan connection works on my TV