Third attempt to post this...
I believe this is the issue that Nikon is repairing at their expense. You can find the advisory
on the Nikon website. Here is some of the text from that advisory:
It has come to our attention that in a
limited number of COOLPIX 3100, 3500, 4500, 5000, 5400, 5700 and SQ
digital cameras, an electronic component may, in some instances, fail
affecting your camera's performance and/or operability.
While only a limited number of COOLPIX 3100, 3500, 4500, 5000, 5400,
5700 and SQ digital cameras are affected by this advisory, if your
camera presents symptoms that can include (1) images with a strong
color tint, (2) images that are totally black and/or (3) images with
visible defects, Nikon will, upon confirmation that the problem is associated to this Service Advisory, service your camera free of charge.
To obtain complimentary service for cameras affected by this advisory,
please click the link below to download and print the Service Return
Form. The Service Return Form provides detailed return instructions.
The Frequently Asked Questions button at the bottom of this page offers
more information about this advisory and, should you have more
questions, also provides information about how to contact Nikon.
We apologize for any inconvenience you may experience.
BTW, I sent my E5700 to Nikon a couple of years ago -- for this same
problem. They repaired and cleaned my camera -- and had it back in my
hands within 7 days.
I hope this helps!
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