io4 distortion noise

I've had an io4 for a few years now and it was working great but haven't used it in the past year and now when I've set it up again I get a horrible distortion noise that does bare an EXTREMELY slight resemblance to the original song. I don't think its the speakers, brand new out the box KRKs and the headphone port produces the same noise. Tried 2 different USB cables too with the same effect. Any ideas? Im using a mac, running 10.10.1
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