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Message: <blockquote data-quote="nickt" data-source="post: 299420" data-attributes="member: 4923"><p>Having a bad lens attached can cause cause the shutter not to work. BUT... I can fire the shutter on my cameras (d3100 and d7x00) in Manual with no lens attached. I can't say for 100% sure, but I am 99.9% sure the d5100 can also fire with no lens attached in Manual. Maybe the seller can try that for you. Maybe also he can lock the mirror up for cleaning and take a picture of the sensor box. That would at least tell you the shutter can open fully and there are no pieces hanging in front of the sensor.</p></blockquote><p></p>