Canon EOS 7D - Manual (Page 265)

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Troubleshooting Guide
If you operate the camera’s dial or lens during movie shooting, the
respective operation noise will also be recorded. Use an external
microphone (commercially available) (p.163).
In low temperatures, the display speed of the AF points may become
slower due to the AF point display device’s (liquid crystal)
characteristics. The display speed will return to normal at room
temperature.
If the LCD monitor is dirty, use a soft cloth to clean it.
In low or high temperatures, the LCD monitor display may seem slow
or might look black. It will return to normal at room temperature.
In fully-automatic modes (1/C), some tabs and options are not
displayed. Set the shooting mode to d/s/f/a/F (p.40).
The [4 Highlight alert] menu option is set to [Enable] (p.167).
The [4 AF point disp.] menu option is set to [Enable] (p.167).
Set the color space to sRGB. If Adobe RGB is set, the first character
will be an underscore (p.86).
When the movie is played, camera operation noise can be heard.
Display & Operation Problems
In the viewfinder, the AF point display speed is slow.
The LCD monitor does not display a clear image.
The menu screen shows few tabs and options.
Part of the image blinks in black.
A red box is displayed on the image.
The file name’s first character is an underscore (“_”).