Rock Band 2 for Xbox 360 Mic problems?

guitar and drums to sync perfectly, but when you try to connect the microphone, said "no microphone has been detected "The microphone is connected to the USB port of the Xbox 360, but still not found. Is there a pattern to follow the microphone is not appears to be the case?

A driver must be connected to the microphone to work. Turn a normal controller works Microphone

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