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I had been using my Cambridge Audio DacMagic Plus connected to my iMac via USB and optical for about a year when it failed. It powers up but will not recognize a signal coming over USB or optical. It also makes a loud and nasty buzz some times but not every time I turned it on. So it's useless to me now. Have any of you experienced reliability problems with your  Cambridge Audio DacMagic Plus? Does anyone have a clue about how I might get it repaired. I thought it sounded great while I had it but I seem to keep having reliability issues with DAC/HAs manufactured in China. This is the third such unit that has failed on me: Yulong D-100, Matrix Mini, and now this one. Sheesh!