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Why internal microphone in my laptop doesn't work?

I start the zoom application that is installed in my laptop.

I click on "New Meeting".

My video is displayed on the screen.  The speaker is working.

However, microphone doesn't work.  "Failed to detect your microphone."  "Please make sure your microphone is properly connected".


I test my speaker.  It works.  

The internal microphone doesn't work.  What might be problem with the microphone?

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>>  how are you testing it?
I open "Zoom" application that is installed in my laptop.  I click on "New Meeting".  I get following message:
"Failed to detect your microphone.  Please make sure microphone is properly connected."
I get Two options:  "Check My Audio Devices" and "Cancel".  I select "Check My Audio Devices".
I click on "Test Speaker".  I can hear the test sound.
The "Test Mic" is disabled.

>>  Does the microphone show up in Device Manager?
No.  
From Device Manager, I click on "Audio inputs and outputs".  Then, it shows Speaker/Headphone.  I don't see microphone.

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>>  Do you see anything in Other Devices?  
"Other Device" is not one of the options in my device manager.  Please see attached filename:  Device_Manager_no_microphone.

>>  Do you see anything showing up with a red or yellow mark?
No

>>  look at the BIOS settings to see if the microphone is somehow disabled.
I shut down my laptop with system udpate option.  After updates completed, computer was shut down.  I turned ON the computer and tried to enter BIOS but I didn't know the key sequence to enter BIOS.
I hear this constant humming sound (I can't really explain what type of sound it is) and now the microphone appears in the Device Manager.  Please see attached filename:  Device_Manager_microphone
I started hearing this sound about six months ago when I downloaded something from usertesting.com website.  I guess someone in my family got annoyed by this constant sound so they disable the microphone.

I tested the microphone as follows:
  • I right clicked on speaker icon (lower right hand corner).  Response was "Playing Audio".  Please see attached filename: Microphone_test_by_right_click_speaker_icon
  • From System - Sound -  Properties, it says "The Device is currently in use".  Please see attached filename:  Microphone_test_from_system_Sound_Properties

No matter where I test microphone from, the microphone is already in use and maybe that's why my test fails.  I think some program I had downloaded from usertesting.com is constantly keeping the microphone in use.

>>  Can you try a Zoom call with a headset? Does the mic work when using a headset?
Since the microphone test failed from zoom, I didn't try zoom call.  Please see attached filename:  Microphone_test_from_zoom

>>  Have you given permission in Windows for your Microphone to be used in apps?
It's a privacy setting.
Yes.  Please see attached filename:  Microphone_access
Device_Manager_microphone.png
Device_Manager_no_microphone.png
Microphone_access.png
Microphone_test.png
Microphone_test_by_right_click_speak.png
Microphone_test_from_system_Sound_Pr.png
Microphone_test_from_zoom.png
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I opened Settings ―> System ―> Sound
There was no "Test your microphone options".  So I did the following:

  1. I went to "Advanced" -> "Troubleshoot common sound problems" -> Input Devices.  I answer 'Yes' to question, "Do we have your consent to proceed with the diagnostics and try automated steps to fix the problem?"  System scanned the device and I heard the tone.
  2. I went to "Advanced" -> "All sound device" -> "Input device" -> "Stereo mix Realtek Audio.  From "Test the microphone" -> "Start Test".  Result was 100% of total volume.  There is also alert in red color that this device is currently in use.
  3. I went to "Advanced" -> "All sound device" -> "Input device" -> "Microphone Array".  From "Test the microphone" -> "Start Test".  Result was 0% of total volume.

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>> Can you try a Zoom call with a headset? Does the mic work when using a headset?
I am in a zoom call.  The other party cannot hear me.  When I increase volume, they can hear constant vibration or humming sound from my computer (I really can't describe this sound, it's annoying sound).  This sound started when I visited usertesing.com website about Six month to year ago and installed some application from there in my computer.
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>> why don't you remove that app then?
I'm not sure what I did when I visited usertesting.com website around June 2022.  I don't see any app installed in Add/Remove Programs around this date.

This is how I fixed the problem.
I went to Settings -> System -> Sound -> Advanced -> All Sound Devices:
There are two input devices.  I selected Stereo Mix.  There was some red flag and it said device is in use.  So, for the Audio, I selected, Don't Allow.
Then, I went back to "All Sound Devices" and selected the other Input device, "Microphone Array".  For the Audio, I selected, Allow.

Now the Microphone works.  No more constant irritating sound.