How do I force restart the camera if the buttons become unresponsive?
If the camera operates erratically or the buttons are unresponsive due to an internal error, force the camera off by holding down the Power button and the Movie shooting button together for 8 seconds. Wait a moment before restarting the camera by pressing the power button. (Page 109)
From the official Canon PowerShot ZOOM Compact Camera manual, page 109
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