Sony VGN-TX00 - Manual (Page 148)

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Troubleshooting
Microphone
Why doesn't my microphone work?
❑ If you are using an external microphone, make sure the microphone is turned on and is properly plugged into the
Microphone jack on the computer.
❑ The Mute button may have been pressed. Check to see if the Mute % indicator light is on. If it is, press the Mute button
to turn on the volume.