The camera turns off by itself, Shooting>related problems, The lens cannot be attached – Canon EOS-1D Mark IV User Manual
Page 250: The card cannot be used, No images can be shot or recorded, The image is out of focus
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Troubleshooting Guide
The camera turns off by itself.
• Auto power off is in effect. If you do not want auto power off to take
effect, set (V Auto power off) to [Off].
Shooting>Related Problems
The lens cannot be attached.
• The camera cannot be used with EF-S lenses (p.39).
The card cannot be used.
• If a card error message is displayed, see page 38 or 256.
No images can be shot or recorded.
• The card is not properly inserted (p.36).
• If you are using an SD card, set the write-protect switch upward (p.36).
• If the card is full, replace the card or delete unnecessary images to
make room (p.36, 179).
• If you try to focus in One-Shot AF mode while the focus confirmation
light <•> in the viewfinder blinks, a picture cannot be taken. Press the
shutter button halfway again to focus, or focus manually (p,41,95,
100
).
The image is out of focus.
m Set the lens focus mode switch to <AF> (p.39).
• To prevent camera shake, hold the camera still and press the shutter
button gently (p.40, 41).
• If the lens has an Image Stabilizer, set the IS switch to <ON>.
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