My camera model is D-720, and when it is turned on, there is a "beep-beep" sound and then it turns off, and I can see the album and settings when charging, so I don't know if there is a problem with the battery or the camera's motherboard is faulty.
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I think a new battery sounds like a good start. The beep beep is often "I don't have enough power to turn on" and its far easier than anything else. If a new battery doesn't resolve, then we can start thinking about other options.
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