Canon EOS 5D Mark III Instruction Manual page 368

Troubleshooting Guide
[Eye-Fi settings] does not appear.
[Eye-Fi settings] will appear only when an Eye-Fi card is inserted into
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the camera. If the Eye-Fi card has a write-protect switch set to the
LOCK position, you will not be able to check the card's connection
status or disable Eye-Fi card transmission (p.344).
Playback Problems
Part of the image blinks in black.
[33: Highlight alert] is set to [Enable] (p.247).
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A red box is displayed on the image.
[33: AF point disp.] is set to [Enable] (p.247).
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The image cannot be erased.
If the image is protected, it cannot be erased (p.272).
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The movie cannot play.
Movies edited with a personal computer cannot be played with the
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camera.
When the movie is played, camera operation noise can be heard.
If you operate the camera's dials or lens during movie shooting, the
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operation noise will also be recorded. Use an external microphone
(commercially available) (p.235).
The movie has still moments.
During autoexposure movie shooting, if there is a drastic change in the
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exposure level, the recording will stop momentarily until the brightness
stabilizes. If this happens, shoot with <a> shooting mode (p.223).
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