Having a good background in electronics, I can only suggest this: 1- Make sure that the battery is in good condition and that it is fully charged. Some rechargeable batteries that have not been used for a long time might give wrong voltage readings because of their faulty condition. They just do not deliver the necessary electric current/power. Get a new battery. 2- Make sure that the battery contacts are clean - also inside the battery compartment of the camera. Storing batteries inside an electronic unit for a very long time might result in corrosion of the contact terminals that will create high electric resistance, not being able to power up the unit - not to mention a degraded state of the battery. Clean the contacts. A new battery might be needed. 3- Has the unit been exposed to any falls or mechanical vibrations? This could have damaged or displaced any mechanical contacts/parts inside it. Get someone qualified (service technician) to check it. It could be fixed, but it could also not be worth...