Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual page 327

Operation Problems
During touch screen operations, the beeper suddenly sounds softer.
Check if your finger is covering the speaker (p.21).
Touch screen operation is not possible.
Check if [Enable] is set with [53: Touch control] (p.55).
Display Problems
The menu screen shows few tabs and options.
In Basic Zone modes and in movie shooting mode, certain tabs and
menu options are not displayed. Set the shooting mode to a Creative
Zone mode (p.46).
The file name's first character is an underscore ("_").
Set the color space to sRGB. If Adobe RGB is set, the first character
will be an underscore (p.139).
The file name starts with "MVI_".
It is a movie file (p.205).
The file numbering does not start from 0001.
If the card already contains recorded images, the image number may
not start from 0001 (p.204).
Troubleshooting Guide
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