You zoom with the lens, not the camera. When you try to zoom, do you not see any change in looking through the viewfinder? Have you tried other zoom lenses to see if they work? I would do that first, because I suspect the problem is with your lens - maybe it has a zoom lock feature that is activated? If you don't have another zoom, go to a camera shop and ask to try one of theirs out on your camera. Good luck!