What you need
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Step 1. Turn the camera on: Put the camera in any mode other than Auto, and turn off the flash. And turn off the LCD screen and press the DISP or DISPLAY button.
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Step 2. Move the camera to any mode: For many canon cameras this will be shutter priority mode, that will give you the longest exposure time without flash.
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Step 3. Take a picture.
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Step 4. Open battery door: After a few seconds open the battery door and then close it again. This will momentarily interupt power during the exposure time.
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Step 5. Repeat: Repeat procedure until the shutter becomes unstuck.
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