If your buttons aren't working properly, there could be a few causes. First, check to make sure that there is no dirt or grime around your buttons. If so, this could cause a potential obstruction between the button and the mother board, hindering the button's ability to work properly. Second, your mother board may be damaged. In this case, follow our guide on how to replace your mother board.
First make sure your camera has the battery inserted (see replacement guide for help). Once battery is inserted the proper way make sure the camera is charged.