A few hours back my IPAD2 was working fine, then suddently it got hanged and after that i tried to switched on and off and nothing worked. However, then i clicked ON/OFF switch for a long time (may be 10 seconds) then i saw the apple logo on the screen (seems something is working). After 30 minutes, screen came back to its original.
I bought this IPAD2 3 days back, if this sort of malfunction occurs, then whats the use of buying such a costly item.
What you did was Reset you iPad. It can become "hung" just like any electronic device that uses RAM and the Reset cleared it. If the problem persists you can call AppleCare to report it, Apple customer care is not here.