Hi. Anyone know how a Formac Gallery display is powered? I've just been given one that I was hoping to plug into my Mini, but I can't find a power socket. It has what appear to be a couple of USB sockets on the back and the three wire cable coming out of the back, which has a USB plug, a DVI plug and another tiny round plug that I don't know what it is. Am I missing something? Can't find any other sockets anywhere. Thanks.