Helen Smith, check your lens. Make sure it is properly retracted. Check the clearance of the lens against the housing. It should be equal all the way around. The camera will shut off if the lens does not extend or retract. If that looks okay, make sure that you battery connectors are not corroded and the the door contact touches both batteries. If that is okay, you may have to take it apart and take a look at the individual components. It is possible that your DC-DC IC has issues