hi gvirmani,
Welcome to the Lenovo Forums.
Just to verify, have you tried to record and playback your voice using the built-in Sound Recorder?


If the microphone levels fluctuates but you're not able to hear anything when you try to playback the recording then there's most likely a defect in the microphone and you may need to contact Lenovo for service.
Alternatively, you can try using a USB headset w/ mic or a USB camera w/ mic as a temporary replacement.
Regards
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