Canon EOS M Instruction Manual page 320

Troubleshooting Guide
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 may look black. It will return to normal at room temperature.
[Eye-Fi settings] does not appear.
[Eye-Fi settings] will appear only when an Eye-Fi card is inserted in
the camera. If the Eye-Fi card has a write-protect switch set to the
LOCK position, you will not be able to check the card's connection LOCK position, you will not be able to check the card's connection LOCK position, you will not be able to check the card's connection
status or disable Eye-Fi card transmission (p.294). status or disable Eye-Fi card transmission (p.294). status or disable Eye-Fi card transmission (p.294).
Playback Problems
Part of the image blinks in black.
It is the highlight alert (p.258). Overexposed highlight areas with a loss It is the highlight alert (p.258). Overexposed highlight areas with a loss It is the highlight alert (p.258). Overexposed highlight areas with a loss
of highlight detail will blink.
The image cannot be erased. The image cannot be erased. The image cannot be erased.
If the image is protected, it cannot be erased (p.252). If the image is protected, it cannot be erased (p.252). If the image is protected, it cannot be erased (p.252).
The movie cannot be played back. The movie cannot be played back. The movie cannot be played back.
Movies edited with a personal computer using the provided
ImageBrowser EX (p.340) or other software cannot be played back
with the camera. However, video snapshot album edited with EOS
Video Snapshot Task (p.196) can be played back on the camera.
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