Hi! Guys. My got my zedboard one week ago. At the beginning, it works fine for getting started, like testing USB and UART port. But yesterday when I insert the SD card on computer and load a file, then insert SD card back to the zedboard(I didn't prebuild SD card) and turn on the power switch, at the beginning , the power LD13 is light up, but after that , all led light off. Whenever I turn on the switch turn on again, the board doesn't power on anymore, also the LD13 doesn't light up. Can anyone know what is wrong with the power? Thank you!