TS3281: iOS: Not responding or does not turn onLearn about iOS: Not responding or does not turn on
You will still need to connect it to a computer's iTunes in order to reset the iPad, and you may need to put it into recovery mode : http://support.apple.com/kb/ht1808
If it hasn't been synced to a computer then (from here) :
If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present.
Have you been backing up to the cloud ?
You should be able to re-download apps and ibooks, and, depending upon what country that you are in, potentially music, films and tv shows : re-downloading.iPad 3rd gen, iOS 6.0.1