@splashmit you can find a really good writeup about the issues with the stuck mirror on the Nikon D model cameras [https://www.exceptionlife.com/photography/question/19253/nikon-d90-mirror-stuck|on here] When you do your repair, take plenty of pictures and create a guide for the rest of us. It'll help the next person that has the same issue with their camera. [link|https://www.ifixit.com/Guide/new|Create a new Guide - iFixit|new_window=true]