Nikon D5000 - Manual (Page 235)

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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 eyepiece correction lenses
(0 25, 202).
Viewfinder is dark : Insert a fully-charged battery (0 16, 28).
Displays turn off without warning : Choose longer delays for Custom Setting c2 (Auto off timers,
0 157).
Information display does not appear in monitor : Shutter-release button is pressed halfway. If
information display does not appear when you remove your finger from shutter-release
button, confirm that On is selected for Auto Information Display (0 168) and that battery is
charged.
Camera does not respond to controls : See “A Note on Electronically-Controlled Cameras,” below.
Viewfinder display is unresponsive and dim : The response times and brightness of this display vary
with temperature.
A
A Note on Electronically-Controlled Cameras
In extremely rare instances, unusual characters may
appear in the monitor 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, turn the camera off, open the memory card slot
cover and, using a paper clip, press the reset button by the memory card slot (this also resets
the camera clock). Note that disconnecting the power source or pressing the reset button
may result in loss of any data not recorded to the memory card at the time the problem
occurred. Data already recorded to the card will not be affected. In the event of continued
malfunction, contact your retailer or Nikon-authorized service representative.
Memory card
slot cover
Reset button