This is most likely caused by one of two things. Either the microphone was inserted in the wrong jack, or the microphone input is not selected in the audio mixer. Check the microphone jack first, if this does not help, open start -> programs -> accessories -> entertainment -> mixer and go to file -> properties. Set the radio “dot” in recording and press ok. This will display a list of usable recording inputs – locate “microphone” and check to select this source.To have a quick test ready simply open the sound recorder tool, likewise from start -> programs -> accessories. The VU-meter will react to microphone sound if all is ok… it is safe to leave the sound recorder on, if you have a lot of harddisk space.