I have noticed that when I insert the power supply pin plug into the Micro HD, I have to kind of wiggle, or slowly turn the plug to make a contact with the power receptacle on the Micro HD. If by some chance you make contact with the MicroBox by gently moving it to clean the area it is located or reposition it the power goes off. It is my conclusion and finding that the plug is not making a good contact with the MicroHD's power supply unit.