My Pentax K100D has suddenly stopped working. It hasn?t been bumped or dropped or anything. A few days ago I was still taking pictures, and then a day or two later when I tried it, it wouldn?t work. When you press the shutter release button, nothing happens. No autofocus, no picture is taken, nothing. The only thing is that you hear a fairly rapid clicking sound, perhaps like a gear wheel turning or something. I tried various settings, new batteries, a different lens, autofocus, manual focus, even a different SD card, but nothing makes any difference. The people at the local camera shop couldn?t do anything either. They just said I would have to take it to a camera repair shop. I?m not very impressed that an expensive camera bought in only August 2006 should give problems so soon.