iPad2 - Will not boot nor cold/hard reset
According to HT1430 there isn't much more that you can do:



Restarting your device


Press and hold the Sleep/Wake button for a few seconds until the red "slide to power off" slider appears, and then slide the slider.
Press and hold the Sleep/Wake button until the Apple logo appears.


Follow these steps to reset your device

Note: Reset your device only if it is no longer responding and the steps above do not work.


Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.




Got an Apple Retail Store nearby for a visit to the Genius Bar?