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"RE: D300s- Back screen does not function with mc-30"
Hi Peter,Make sure that you are not inadvertantly pressing the shutter release button on the camera, MB-D10 if you have one mounted on the camera, or the button on the MC-30 half way.There could be a short in the cord. Does the AF system activate when the cord is connected to the camera?Good Luck and Enjoy your Nikons!