I had a lock up problem with my camera one day. It turned out to be a defective memory card. Try powering down the camera (if it will not do so via the power switch, or by being left untouched for several minutes, pop the battery out). Then remove the memory card, put the battery back in, and see if it will power up properly. If it does, power it down again, reinstall the memory card, and see if it will power up and operate with the memory card back in. I would then suggest reformatting the memory card to ensure that the file structure is not corrupt. If the problem persists (like it did with me that one nasty day), pick up another memory card and try using it. I have not had any problems since with the new memory card.
Hope this helps, if not it was something else for you to try.
Spyglass
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