1. When you go to settings and try to pull up wifi list does it show any connections at all? (yours, neighbors, etc.)
- If no connections are shown make sure airplane mode is off and your wifi setting is turned on, otherwise you have a wireless card failure.
-If you do see connections and attempt to connect to your network is it giving you an error? If its a password error and you know the password is right, forget the network (normally by holding down on the highlighted network and select forget) and add it again and try. If it is another error please post.
-If you do see other's connections and not your own then make sure your 2.4 ghz bandwidth frequency is turned on, some devices do not have the hardware to see the 5ghz frequency.