M-Audio C400 won't receive any audio output in Mavericks

Hello
I recently bought a M-audio C400 and a pair of KRK RoKit RP8 speakers for my studio. But the C400 wont receive ant output signal from my Mac.
The computer runs OSX Mavericks and have been working with USB audio output before.
Is this a problem you're aware of or might the hardware suffer from some malfunction?
Thanks in advance

@julfinch
I'm sorry to hear this, contact your local Xperia Care and request a vacuum test
http://support.sonymobile.com/global-en/contactUs/
keep in mind that although the phone it's waterproof, sea water will destroy your phone. 
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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