I just acquired a used iUsb Power supply and Gemini USB cable. I’ve connected the iUsb to both my desktop pc and my Meridian Direct dac. I am unable to get the iUsb to power up the Dac. I think I followed the hookup directions correctly. Am I missing a trick or did I just buy a broken unit? The unit powers up with its power supply and all three lights glow. I just can’t power up my Direct Dac. I am thoroughly confused. ANY help would be GREATLY appreciated. Thanks in advance.