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When I take a photo on my Nikon D5000, it comes up with an error "press shutter release button again". When I do that, it gives me the same error, and my pictures turn black. Also, when I take my lens off, the mirror is stuck up.
Check the viewfinder for some kind of error code, I had the same issue with my D80, and there was just ERR message, if the same will happen to you, the DSLR will need to see a repair shop.