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Then reseat it in the dock. Zune is locked up/ frozen Please make sure your Zune is working properly before docking into the unit. Please refer to your Zune manual for details. Zune battery has problem No AM band radio sound but others OK AM loop antenna is not connected to the unit Plug the AM loop antenna connector to the jack on the back of the unit Radio is very noisy AM/FM antennas not located properly Move the AM loop antenna away from the main unit/Zune and rotate it for best reception. K