Canon EOS 7D Instruction Manual page 264

Troubleshooting Guide
The external flash does not fire.
Make sure the external flash (or PC sync cord) is securely attached to
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the camera.
If you use a non-Canon flash with Live View shooting, set the [z

Silent shoot.] menu to [Disable] (p.141).
The camera makes a noise when it is shaken.
The built-in flash's pop-up mechanism moves slightly. This is normal.
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The shutter makes two shooting sounds during Live View shooting.
If you use flash, the shutter will make two sounds each time you shoot
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(p.137).
Live View shooting is not possible.
For Live View shooting, use a memory card (a hard disk-type card is

not recommended). A hard disk-type card requires a lower
temperature range for operation than normal memory cards. If the
temperature gets too high, the Live View shooting may stop
temporarily to prevent damage to the card's hard disk. When the
camera's internal temperature decreases, you can resume Live View
shooting (p.137).
The camera button/dial's function has changed.
Check the setting with [8C.Fn IV -1: Custom Controls] (p.231).
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The movie shooting terminates by itself.
If the card's writing speed is slow, movie shooting may stop

automatically. Use a card with a read/write speed of at least 8 MB per
sec. To find out the card's read/write speed, see the card
manufacturer's Web site.
If the movie file size reaches 4 GB or if the movie recording time
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reaches 29 min. 59 sec., movie shooting will stop automatically.
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