Trouble Connecting to WiFi after Internet Sharing

hey guys i'm having problem macbook pro late 2011 running lion. whenever bring computer school, internet via ethernet cable connection. turn on internet sharing wifi on iphone. however, when return home use computer, won't find wifi because internet sharing stuck on , have tried turn off , won't work. i've tried go top , click wifi off, , turn on still no luck. thing i've found work restarting computer, , logging off doesn't trick! appreciated!!

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