Confirm that the blue LED illuminates while the mic is connected to your computer. If the LED does not illuminate double check that the USB cable is fully connected to both the bottom of the microphone and the USB port of the computer or USB hub being used. If the blue LED illuminates, but the mic isn’t recording any sound, you’ll need to check the control panel or system preferences of your system to ensure that the microphone is set as your default/primary recording device.