What would prevent me from turning on wi fi?

I,ve been using my MacBook Air with a comcast provided router for 18 months without a connectivity problem until today. Suddenly the wi fi is turned off and I cannot get it to turn on. There are no bars showing on the indicator, but wi fi is working because I am using my iPad mini to post this query. What would cause the MacBook Air wi fi to shut down? It worked fine yesterday.   Any suggestions would be appreciated.  Thanks.  Bill

For anyone interested, I think the crux of this issue was that once upon a time, my son also had an iphone, and then was switched to non-phone (he dropped his iphone and it cracked beyond use). I went through the "unregister" process that is documented online. However, something stuck. That said, my plan was always to get him an iphone in the future, but was waiting for his plan to be in upgrade mode, and also, I had him use a crappy phone to understand the value of a nice phone -- even though, he only had an iPhone 4, 8G, and it was free, I wanted to teach him about taking care of the phone...
That said, he got his upgrade a few days ago, and it immediately fixed the iMessage issue on his iPad...odd, still.

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