What can happen is the foam bumper along the top edge of the reflex box breaks down and gets tacky which then adheres to the mirror frame preventing it return to its normal position. Carefully take the Lens off and with your fingernail see if you can unglue it. It only take a very little pressure to break the adhesion. '''Don’t force it!'''
If that works you’ll need to replace the bumper with a fresh one. This is not easy to do and if you are not careful you can damage the focusing screen as well as the mirror trying to clean off the old foam and its traces.
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Best to let an authorized Nikon service center fix your camera. They can get the needed parts and have the skills.
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Your battery likely needs to be replaced as well as it sounds like its been well used. The power outage shouldn’t effect it. But the surge on the power being restored could have! Where you using a good surge suppressor?
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Best to let an authorized Nikon service center fix your camera. They can get the needed parts and have the skills to deal with all your issues.
What can happen is the foam bumper along the top edge of the reflex box breaks down and gets tacky which then adheres to the mirror frame preventing it return to its normal position. Carefully take the Lens off and with your fingernail see if you can unglue it. It only take a very little pressure to break the adhesion. '''Don’t force it!'''
If that works you’ll need to replace the bumper with a fresh one. This is not easy to do and if you are not careful you can damage the focusing screen as well as the mirror trying to clean off the old foam and its traces.
Best to let an authorized Nikon service center fix your camera. They can get the needed parts and have the skills.