wi-fi

Well what wi-fi connections are you talking about, obviously only one of them can be yours, just look for your network name should be the one at the top with the strongest signal click on it and input your network password which should be printed on the underside of your router.
 
Could be a thousand reasons. Do you see other wireless networks, just not yours? If so then it's most likely an issue with your wireless router/AP. If you don't see any then it's an issue with your computer most likely.
 
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