My Wifi is not allowing connections

My IPad2 all of a sudden stopped connecting to any network wifi.
The Wifi button is on, I can see all the broadband network available.  for one minute it was working fine, and then all of a sudden it stopped working. 
I have done the following:
Reset Network
Reset System
Reboot by holding down and start and on/off button until Apply icon shows up
Rebooted network routers
Tried a different Wifi hotspot
Everything I have done above, I still face the same problem. Every network I tried to link, it all shows "Can not connect to 'xxx' network"
what should I do?

If a restore did not fix it, you have a hardware issue--possible bad wi-fi radio.
Basic troubleshooting steps. 
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 

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