[MacBook Pro] Gros problème de connection internet par cable

Bonjour a tous ,
J'ai mon mac depuis +1ans , je me suis jamais connecter a internet via Cable ethernet .
J'ai voulu tester ma connection fibre via Cable ethernet mais lors du branchement pas d'internet .
Je rentre dans les réglages je suis connecter mais les dns ne sont pas trouver .
Après 1 heures de recherche je trouve rien j ai appeler apple , j ai ue droit a un reboot de la carte internet marche toujours pas .
J ai eu droit au démarrage tout en gardant appuyer ( cmd+R ) je vais sur aide en ligne et la quand le cable et brancher wifi éteint tout marche .
Et la apple me dit que pour résoudre le problème je doit débourser 49€.
Es que vous avez une soluc ?.?????
Je suis sur macbook pro 13
Je suis chez sfr fibre 1Giga/s
Les ordi sous windows marche tres bien et ma wifi mac aussi .

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[MacBook Pro] Gros problème de connection internet par cable

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