Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 516)

Troubleshooting Guide
516
Set the power switch to < 1 > (p.53).
Check the [ 8 6: Multi function lock ] setting (p.439).
Set the vertical-grip operation switch to < 1 > (p.67).
Touchscreen operation cannot be performed on the menu screen and
image playback screen. For Live View shooting and movie shooting,
touchscreen operation can be performed to select AF points and to
magnify the image.
Check the [ 8 6: Custom Controls ] setting (p.445).
Under the [ 9 ] tab, [ Menu display ] is set to [ Display from My Menu
tab ] or [ Display only My Menu tab ]. Set [ Normal display ] (p.469).
Set the color space to sRGB. If Adobe RGB is set, the first character
will be an underscore (p.200).
Operation Problems
I cannot change the setting with the < 6 >, < 5 >, or < 9 >.
Vertical-grip controls like the < 6 > and < 9 > do not work.
Touchscreen operation is not possible.
A camera button or dial does not work as expected.
Display Problems
The display starts with [ 9 ] My Menu or the [ 9 ] tab alone is
displayed.
The file name’s first character is an underscore (“_”).