Batteries are low or empty. Replace the batteries or use the AC Adapter. Pictures remain in the camera's memory when the battery is removed. Camera is not turned on. Turn the camera on and verify that the green Ready light turns on.
Ready light is red.
No memory card in camera or the memory card is full. Insert a new memory card. Shutter button does not work. Camera is not turned on. Turn the camera on and verify that the green Ready light turns on.