Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 326)

Troubleshooting Guide
326
Make sure the card is properly inserted (p.31).
Slide the card’s write-protect switch to the Write/Erase position (p.31).
If the card is full, replace the card or delete unnecessary images
to make room (p.31, 268).
If you try to focus in the One-Shot AF operation while the focus
confirmation light <o> in the viewfinder blinks, a picture cannot be
taken. Press the shutter button halfway again to refocus automatically,
or focus manually (p.43, 103).
If a card error message is displayed, see page 32 or 337.
Set the lens focus mode switch to <AF> (p.39).
To prevent camera shake, press the shutter button gently (p.42, 43).
If the lens has an Image Stabilizer, set the IS switch to <1>.
In low light, the shutter speed may become slow. Use a faster shutter
speed (p.110), set a higher ISO speed (p.92), use flash (p.107), or use
a tripod.
Shooting-Related Problems
No images can be shot or recorded.
The card cannot be used.
The image is out of focus.
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