I'm using the same mic with no trouble. First plug in a headset or ear buds into the mic, while the mike is connected to the computer. Audio Yes - problem likely in the computer. Audio No - problem likely in the mic. Remember that the pc "control panel" has audio source selection, and the Audicity Software also has audio source selection. If it worked, and then stopped working, without you making any audio source settup changes in your computer via your keyboard, then it could be infant mortality of the mic. Before returning, try plugging into a friends computer.