Canon EOS rebel xs - Manual (Page 172)

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If there is a problem, first refer to this Troubleshooting Guide. If this
Troubleshooting Guide does not resolve the problem, contact your
dealer or nearest Canon Service Center.
The battery is not properly installed in the camera. (p.26)
Recharge the battery. (p.24)
Make sure the battery compartment cover is closed. (p.26)
Make sure the card slot cover is closed. (p.31)
Press the <B> button. (p.42)
If the power is cut off while an image is being recorded to the card, the
access lamp will light/blink for a few sec. After the image is recorded to
the card, the camera turns off automatically.
Use a fully-charged battery. (p.24)
The rechargeable battery will degrade after repeated use. Purchase a
new one.
Auto power off is in effect. If you do not want auto power off to take
effect, set the [5 Auto power off] menu to [Off].
Even if [5 Auto power off] has been set to [Off], the LCD monitor will
turn off after the camera is idle for 30 min. Press the <B> button to
turn on the LCD monitor.
Troubleshooting Guide
Power
The camera does not operate even when the power switch is
set to <1>.
The access lamp still blinks even when the power switch is
set to <2>.
The battery becomes exhausted quickly.
The camera turns off by itself.