Problem with Network capability on Lenovo Ideapad Z470?

My laptop was working fine a few days ago until it refused to connect to any wireless networks. Nothing shows up when I click the network icon. It just says No Internet access. When I try to diagnose it it suggests turning on the Network capability switch even though it is clearly on. What is the problem and how do I fix it? Thanks in advance
P.S: I ve also tried to press Fn+F5 but nothing shows up

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