Formated macbook and now can't connect to internet

Hello people,
I just formated my whole macbook because the windows version I installed on it wasn't working well and was actually slowing the mac.
I remade my disk one ( only 1 partition ), installed everything, but now I can't connect anymore with my ethernet cable. I try to plug it in my normal Computer next to it and internet works. It just only doesn't work with the macbook. It's very strange because before I formated it, everything was working well.
It cannot find the IP address alone and doesn't recognize the internet.
Anyone got an idea?
Thank you very much!
Chris

Carolyn!
I first thought that with the little info I gave no one would even try to answer, therefor my astonishment when I tried to do what u said and internet worked!
Thank you very very very much for you quick answer. I opened my macbook did what u said and in 2 minutes the problem was solved ( I spent the whole afternoon looking for forums where I could find an answer )
Thank you! Very much you saved me much time!
Have a good day!
Chris

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