This is not good news. Chances are that there is an oxidized copper trace on a ribbon connector that is not allowing the memory to be read correctly. Over time, humidity can take it's toll on copper traces, and play havoc with signals. You can try to slightly hit the camera, to try to jar the ribbon connectors in the camera, getting them to make contact. Next step is to take it apart, and unhook the ribbon connectors, and maybe spray them with contact cleaner, then reconnect them. Aside from doing those things, my guess is that service would cost more than it's worth, and it would be better to invest in a new one. Good luck, and hope this helps!