Je ne capte plus le wifi

Bonjour, j'ai un petit problème. Voilà, quand j'ai débranché ma box, mon macbook air n'a plus capté ma wifi et pourtant tous les autres appareils dans la maison ( autre ordinateurs, iPhone, iPad, tablette oui ), j'ai donc redébrancher la box mais rien n'y fait. J'ai vraiment besoin de mon ordinateur pour mes cours donc si quelqu'un a une solution à me proposer se serait gentil. Merci à tous et bonne soirée.
Hello, I have a little problem. When I unplugged my box, my wifi doesn't work in my macbook air but all the computers or iPhone or iPad, my wifi works on them. I have unplugged again my box but it didn't work! I have very need of my computeur for the school, so, if somebody have a solution, please, help me. Thanks for reading me.

Google translate:
How to reactivate his iPod touch as it is off and I can not reactivate it please help me thank you
If the iPod does not turn on:
Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar       
If the screen shows the Disabled the follow the instructions here:
iOS: Wrong passcode results in red disabled screen

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