Xperia phone won't connect to home wi-fi

I own a Xperia ray, with Android version ICS 4.0.4. I've been using a Linksys Cisco WRT120N router for a while now without problem until I had to change SSIDs and passwords because of unauthorized use from neighbors. It is connected to ADSL and to a desktop PC. Since the password change I've been having connectivity problems with the wifi and phone, but it works perfectly for the desktop pc and laptop. Whenever I try to connect to the wifi using my phone, it says "Connected", but doesn't seem to have any internet connection. I have tried the following: Updating my phone (erasing all my data, which is now a waste), followed a LOT of forums (using static IP, updating router firmware, changing wireless security level, MAC filtering, and everything else on which I have no freaking idea about). Nothing seems to work, and is really frustrating because I use my phone for personal business and work, and I really need it to be fixed ASAP. Any help would be greatly appreciated.

PS. I tried connecting to other networks (malls, coffeeshops, neighbors) and it connects perfectly. I'm starting to think that it is my phone that has the problem. I hope not.
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More about xperia phone connect home
  1. Try updating the firmware on your router to the latest version.
  2. If you change back to your old SSID and password, does the connectivity problem on your phone go away?
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