Aw man, that sucks. It looks like there’s a direct DC connection on the board (#6 and #7 below). http://www.mikrokopter.de/ucwiki/en/FlightCtrl_ME_2_5Says "not needed if you use the Molex connection”, but maybe your Molex is bad? Do you have a bench power supply? I’d just throw 12VDC on the FC board and see if it wakes up.