I dug up my Entech Number Cruncher 203.2 DAC from back in the day and it used to work just right. But now nothing seem to go through it anymore. I checked all my connections and they're all right. There's also a light coming from my toslink cable from the source before I plug it into the DAC, but the green LED on front doesn't light up and there's no sound! Anyone got an idea for a fix?