MacBook Pro Connects to Wifi while Macbook Air and 2 iphones don't

Today when we got home from work my boyfriends Macbook air couldn't connect to the internet, he restarted the router and modem and it still didn't work, my Macbook Pro connected as usual and is working perfectly, both of our iphones can't connect either.  We tried forgetting the network on the iphones and ran through network diagnostics with the Air, at first it would fine the wireless but insist we were typing in the wrong password despite KNOWING we were doing it right and now it won't even see any of the 15+ networks in our apartment building. Any ideas?  Super non-tech savy so it might be something stupid....

Hello HMCIN08,
The following article contains information that may be helpful in restoring your ability to connect to the internet.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Cheers,
Allen

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