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Hi! It sounds like that the shutter cable inside lens is partially broken. It moves with the lens while it zooms, so it could loose contact while stretched - when you have zoomed the lens. Z750 and Z850 have this problem with shutter cable - it breaks. The white horizontal lines are because shutter doesn't work. I'm afraid the cable will brake soon and pictures will be too bright with white horizontal lines even at normal zoom. It is considered a hard repair - the shutter part or whole lens unit has to be changed. You can contact your local Casio service center and ask the price, but it will probably be very high. I work in a Casio service center and new lens for this camera costs about 250$. It's not a good idea to put on used lens or shutter, as it will brake again sometime - it's just a matter of time. I suggest you get another camera.
Try removing the batteries and memory card. Let the camera set for awhile. Put the batteries back in but not the memory card, restart the camera. Does it work know? If it does, turn the camera off put the memory card back in. Turn the camera on, does it work now? If it doesn't, replace the memory card.
Take the lens off and continue pressing the shutter untill it doesn't react anymore, you should then have a normal menu without the error message.Put your lens on and you're all sorted.Cheaper and less hassle than sending it to Nikon. olly