Nikon 4500 - Manual (Page 170)

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Technical Notes
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, and turn the camera on again, or, if you are using an AC adapter
(available separately), disconnect and reconnect the adapter and turn the cam-
era on again. In the event of continued malfunction, contact your retailer or
Nikon representative. Note that disconnecting the power source as described
above may result in loss of any data not recorded to the memory card at the
time the problem occurred. Data already recorded to the memory card will
not be affected.