I have the basic Adafruit "Light & Temperature data logger Tutorial kit" made, and it works well when connected to a PC, but when I unplug the PC USB connection and hook it up to another power source, it will not launch and run by itself. I have reset both the logger and Arduino board reset buttons, but it does not seem to start recording data to a new file. One of my power sources was a Solar panel / Solar Lithium Battery charger (with the "Power Boost 500 basic 5V boost board, and an another alternate power source was a 6 x AA battery holder with a barrel jack connector. What am I missing here? I'm a newbie! Thanks.