Canon PowerShot S5 IS User Manual page 178

The High-Power Flash will not fire under the following
circumstances.
- When shooting in
- When [Flash Sync] is on [2nd-curtain]
- When [Flash Adjust] is on [Manual]
The flash charge time will lengthen as the battery charge
gets weaker. Always set the power/mode switch to off
when you finish using the flash.
Be careful not to touch the flash window or sensor
windows with your fingers while the flash is in use.
The flash may fire if another flash is being used in close
proximity.
The High-Power Flash may not fire outdoors in daylight or
when there are no reflective items.
For continuous shooting, although the flash fires for the
first shot, it does not fire for subsequent shots.
Fasten the attachment screws securely so that they do not
loosen. Failure to do so may lead to the dropping of the
camera and flash resulting in damage to both.
Before attaching the bracket to the flash, check that the
lithium battery (CR123A or DL123) is installed.
To illuminate the subjects properly, install the flash so that it
is up against the side of the camera and parallel with the
camera's front panel.
A tripod can be used even when the flash is attached.
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