Same Problem. This board has worked previously just fine. Funny thing is the LEDs show 5v and they are powered off the FC, evidently there is 5v working fine on the board with no short. When plugged into a computer by USB the board runs just fine, if I connect a battery and then unplug the computer it still works just fine. However I cant get power into the board when I just use a battery. The 5v rail goes into a spare ESC 5v connector. Any help would be appreciated.