MBA no longer detects home wifi

Hi!
I've had my MBA for a few months and always used it at home with no issue. Recently my housemate forgot to pay our internet bill and our connection was cut. Now my MBA won't pick up my wifi, but my housemates pc can use it. Iv reset the router and updated its firmware etc but still no luck!
I can use wifi in college and also via ethernet, I just can't find my home network!! any suggestions??
Thanks!!

I am confused. Last night I was able to connect to my network, and three machines on the network, but not out to the internet. Airport would only assign itself an internal IP 169.xxx. I just got home, opened MBA, and today my TCP/IP is configured from the router with an IP of 10.0.11, and back to normal operation. This was the second time that I lost connection to the internet, but not to the network, and all other machines on the network connecting fine.

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