My D200 just started having difficulties today after not being used for a few months (medical school has been killing me). When I turn the camera on the shutter releases, then the shutter will release one more time with only pressing the release button half way. After that the shutter will not release when I press the button. I have replaced the battery, tried it on manual focus, tried it without a lens and still no change the same thing happens. When I press the button r19 shows up. Also when I push the menu or play buttons by the LCD screen nothing happens, no display lights up.