Case 1: The iPad works other public wireless but home.
Troubleshooting: 1. Upgrade wireless router firmware.
2. Change the wireless security settings from WEP WPA.
3. Reboot router AP.
Case 2: The iPad can access the Internet at home but office.
Troubleshooting: 1. The office has prosy server to control the Internet access. Please refer to this post: iPad can't access the internet cases
Case 3: Can't setup iPad Wi-Fi and it is grayed out
Case 4: Remove all Wi-Fi settings and re-add them.
Case 5: reset the wireless router to the default with no security wireless. After it works, add wireless security.
How to enable Recovery Mode in iPad
How to check IP address in iPad
How to configure HTTP Proxy in iPad
How to configure static IP address in iPad
How to renew IP address on iPad
How to setup Wireless on iPad
iPad can't play video
iPad can't access the internet cases
iPad keeps dropping or losing wireless
iPad Wireless Configuration
iPad Wi-Fi Issues