Canon EOS 5D Mark III Instruction Manual page 372

Troubleshooting Guide
The time code cannot be appended during HDMI output.
If the movie-recording quality's frame rate setting is set to a value that
does not function properly in combination with the NTSC/PAL frame
rate, the time code will not be appended to the HDMI output image.
The HDMI output image has a temporary frame stop.
When the movie shooting ends, the HDMI output image pauses (frame
stop). When writing to the card is completed, the movie is output
normally.
Movie shooting stops if I connect or disconnect the
HDMI cable.
If you connect or disconnect the HDMI cable during movie shooting,
the movie shooting will stop.
Operation Problems
I cannot change the setting with <6>, <5>, or <9>.
Set the <R> switch to the left (lock release, p.47).
Check the [82: Multi function lock] setting (p.325).
The camera button/dial's function has changed.
Check the [82: Custom Controls] setting (p.327).
Display Problems
The menu screen shows few tabs and options.
In the <A> mode, only certain menu tabs and options are displayed.
Set the shooting mode to <d/s/f/a/F> (p.51).
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