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Did you try holding the on/off switch to the right for like 10-15 seconds before releasing it, as if you wanted to fully shut down and not the sleep mode?
They only other shot in the dark I can think of is inserting memory cards and/or removing them, or holding the main menu button and vol+ at the same time and then activating the on/off switch (not sure if I got that right off the top of my head, but I am thinking of the test mode).
Let us know what happens.
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