My iPad 3's Wi-Fi also is not working. It detects Wi-Fi access points just fine and even shows that it is connected to mine, but nothing loads. Tried the tips posted here to no avail.
Solved: If your router has an option called WMM, activate it and problem solved!
No I don't. I have a DG834G v3, I have looked around and apparently it is supposed to be turned on by default.