Ipad 2. Airport express. I am using a mac on the wifi system. The ipad has worked on the same wifi in my apt. BUT now it recognizes the wifi, shows full bars in the signal but will not connect. Took it to local apple store and in store it connected no problem. So, brought it home and it worked fine for about a week....now it will not connect. The macbook works fine and also a laptop we have. But the ipad and now our iphones will not work on the system. Suggestions please? Thanks and have a great day.