You didn't mention placing iPad into recovery mode and attempting to restore again. So I'll take a chance and refer you to another support document. (If you have already tried this, just ignore me.)
iPad: Unable to update or restore, http://support.apple.com/kb/ht4097
For what it's worth, try to explain what you tried or what support documents weren't helpful. Saying that you have tried everything doesn't give anyone trying to help you a place to start.
You have a one year warranty on your iPad 2. If nothing works, make an appointment to have an Apple Retail Store Genius look at your iPad. http://www.apple.com/retail/geniusbar/