I put my D5100 in a place I should not have and it was knocked off. After a 5 foot fall I try to take a pic and only get partial shutter movement with an error message to press the shutter button again. Is it worth a trip to Nikon for a repair or should I try for a new 5100 body or upgrade to a D7000? If I opt for a new body, I am willing to crack open my busted camera and play with the little red gear I have read about that is the root of the error.