Canon EOS 7D Instruction Manual page 265

When the movie is played, camera operation noise can be heard.
If you operate the camera's dial or lens during movie shooting, the
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respective operation noise will also be recorded. Use an external
microphone (commercially available) (p.163).
Display & Operation Problems
In the viewfinder, the AF point display speed is slow.
In low temperatures, the display speed of the AF points may become
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slower due to the AF point display device's (liquid crystal)
characteristics. The display speed will return to normal at room
temperature.
The LCD monitor does not display a clear image.
If the LCD monitor is dirty, use a soft cloth to clean it.
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In low or high temperatures, the LCD monitor display may seem slow
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or might look black. It will return to normal at room temperature.
The menu screen shows few tabs and options.
In fully-automatic modes (1/C), some tabs and options are not
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displayed. Set the shooting mode to d/s/f/a/F (p.40).
Part of the image blinks in black.
The [4 Highlight alert] menu option is set to [Enable] (p.167).
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A red box is displayed on the image.
The [4 AF point disp.] menu option is set to [Enable] (p.167).
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The file name's first character is an underscore ("_").
Set the color space to sRGB. If Adobe RGB is set, the first character
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will be an underscore (p.86).
Troubleshooting Guide
265