So I got a refurbished macbook air and everything was great and looked brand new except the wifi wasn't there. When I booted it for the first time the option showed but it was unclickable and once past booting it simply wasn't there, like it didn't exist anywhere. Took it to best buy to see if I did the initial set up wrong but they say it's a faulty wifi chip. Letting them run a diagnostic to be sure. Hoping that is all it is because otherwise there didn't seem to be anything else wrong with it, it looked in physical good shape like brand new and everything. Just wondering if anyone else has had to get it replaced or fixed? I'm so worried to hear the diagnostic results. I'm hoping faulty wifi chip is all there is just like it seems.