Canon REBEL T3I EOS 600D User Manual page 284

Troubleshooting Guide
Playback Problems
The LCD monitor does not display a clear image.
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.
Part of the image blinks in black.
It is the highlight alert (p.228). Overexposed highlight areas with a loss
of highlight detail will blink.
The image cannot be erased.
If the image has been protected, it cannot be erased (p.222).
The movie cannot play.
Movies edited with a personal computer using the provided
ZoomBrowser EX/ImageBrowser (p.302) or other software cannot be
played with the camera. However, video snapshot albums edited with
ZoomBrowser EX/ImageBrowser can be played on the camera.
When the movie is played, camera operation noise can be
heard.
If you operate the camera's dials or lens during movie shooting, the
operation noise will also be recorded. Use an external microphone
(commercially available) (p.160).
The movie has still moments.
During autoexposure movie shooting, if there is a drastic change in the
exposure level, the recording will stop momentarily until the brightness
stabilizes. If this happens, use manual exposure (p.144).
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