Camera and Video
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First make sure you have good batteries, if the batteries are known to be ok then look carefully at the lens, try holding upside and shake as you turn it on, this fault occurs due to an obstruction or misalignment in the lens mechanics..
Try thumping the camera into the palm of your other hand as you turn it on to try and bounce the lens back into place, be as forceful as you can stand, thats why to use the palm of your hand.
If still no luck then the camera has to be dismantled and may be uneconomical to repair...