Nikon D800 - Manual (Page 436)

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Troubleshooting
If the camera fails to function as expected, check the list of
common problems below before consulting your retailer or Nikon
representative.
❚❚Display
Viewfinder is out of focus : Adjust viewfinder focus or use optional diopter
adjustment lenses ( 0 35, 388).
Viewfinder is dark : Insert a fully-charged battery ( 0 19, 37).
Displays turn off without warning : Choose longer delays for Custom Setting c2
(Auto meter-off delay) or c4 (Monitor off delay) ( 0 291, 292).
Displays in control panel or viewfinder are unresponsive and dim : The response times
and brightness of these displays vary with temperature.
A
If the Camera Stops Responding
In extremely rare instances, the displays may not respond as expected
and the camera may stop functioning. In most cases, this phenomenon
is caused by a strong external static charge. Turn the camera off, remove
and replace the battery, taking care to avoid burns, and turn the camera
on again, or, if you are using an AC adapter (available separately),
disconnect and reconnect the adapter and turn the camera on again. If
the problem persists, contact your retailer or Nikon-authorized service
representative.