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If you zoomed to maximum zoom factor, and did not use a tripod, then you have a possible cause for blurring: not using a fast enough 'speed'. If the speed is too slow, blurring will take place owing to camera shake from hand-holding.
(I am aware this is only an initial guess. Tell me more about the conditions and settings, and I'll be able to judge better as to what is wrong.)
Was the camera originally working OK? as far as focus in pictures taken is concerned?