After my son tried to take off the lens of my N65, and tried to put on another one, I looked through the viewfinder to see that the image was almost black, and that the camera would not take any photos. Perhaps the manner with which he took off the lens and/or put on the other one damaged a part or pushed something out of place? I've heard such a problem happens when the mirror gets stuck in the up-position, however; I have no experience in handling such technicaly issues. Any help would be immensely appreciated, thanks.
Burc