The same problem! Just received Antminer A3 and board number 2 is not working! Stop buying people that ASICs!! They are all seems to be defetive!
LOL... Says the guy who just bought an ASIC
There are bound to be defective units shipped out. no different than buying a Dell computer or a Graphics card. the fact these boards aren't flooded with people complaining about receiving defective units means that there are far more working units than defective units.
It could also be just a loose connector