There may be several reasons why your device may not be powering on. Following are the common ones: (1) The battery may not be sufficiently charged. It may discharge automatically if not used over a long period of time. In this case, simply charge the battery. Also, check to make that the battery is inserted in correct orientation. (2) The battery terminal may not be clean. You may clean the terminal with microfiber. (3) External temperature also effects the way the camera functions. Thus, make sure to not use the camera when the temperature is above or below 0-40° C. Condensation might occur if the camera is moved from extremely cold temperature to a warm environment, which could prevent the camera from functioning properly. In that case, let it come to room temperature and allow the condensation to evaporate naturally. (4) For more information, refer to the troubleshooting page.