Mine locked up when I tried to do the notification bar hack. Like yours, it wouldn't respond to anything. I opened up the back and disconnected the battery for several minutes, put everything back together and it worked fine again.
Be careful if you try to remove the back. There are several pieces of double sticky tape helping to hold things together. You need to carefully slide the back down about 1/8 inch or so before the interlocking tabs clear and you are able to lift the back. The tape makes sliding and lifting the back piece a chore the first time.
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