Audio problem with MC6000

I am having a problem with my MC6000, I can hear the audio at very low volume, but as soon as I try to turn up the volume (anything past 10%), I get nothing but distortion. I have tried on both VDJ7 and 8, on both Mac and Windows, using multiple USB cords. I have tried reinstalling the drivers and firmware, with no luck. This distortion happens both though the main outputs, as well as through my headphones through monitor output for cued songs. Could there be a problem with the soundcard in my board?