What lens do you have? Without knowing anything else, it sounds like a cable ribbon inside your zoom lens had been damaged (by the zooming in and out), preventing proper operation at a certain zoom range.
When the lens can't focus, the camera won't take a picture. If the ribbon damage is the case, you need to send the lens in for repair. Some people buy the part and do it themselves (which is beyond my ability). You should try another lens to rule out some other reasons.
