Windows 10 may not hear your microphone sound for several reasons. All common PC microphone troubleshooting steps are still important, but Windows 10 includes a new system-wide option that completely disables microphone input in all applications.
Check Windows 10 Microphone Options
The Windows 10 settings have some options that disable the entire microphone system in all applications. If your webcam is disabled in Settings, even desktop applications can not get microphone input.
This is a little confusing. Generally, the App permissions under Settings> Privacy only affect new applications from Store, also known as Universal Windows Platform, or UWP, applications.
If your microphone is not working, go to Settings> Privacy> Microphone.
At the top of the window, make sure it says "Microphone access for this device is on." If Windows says that microphone access is turned off, click "Modify" and set it to "On." If access is off, Windows and all applications on your system can not access audio from the microphone.
Below this you'll see that "Let apps access your microphone" is set to "On." If microphone access is off, all programs in your system can not hear audio from the microphone. However, the Windows operating system still has access.
Under "Choose which apps can access your microphone," make sure the app that wants to access your microphone is not listed and set to "Off." "If it is, put it to" On. "
Only new style apps from the store are displayed here. Traditional desktop apps from the store will never appear in this list and will always have access to your microphone as long as" Allow apps to access your microphone "setting is on.
Make sure your microphone is not deactivated by other means
You can turn off the microphone in other ways. If you have a portable computer with an integrated microphone, some laptop computer manufacturers may turn off this microphone in the computer's BIOS or UEFI settings. This option is not available on all laptops, but is likely to be close to an option that lets you turn off your webcam if it exists.
If you previously disabled the built-in microphone through your computer's BIOS, you need to go back to your BIOS settings and re-enable the microphone device.
You can also disable the integrated microphone device through the PC Device Manager. If you have previously done this, you must return to Device Manager and reactivate it.
Install or Update Audio Drivers
Windows 10 tries to install and update drivers automatically. It usually works well, but sometimes it does not.
If you have a problem with the sound, you may want to go to your PC manufacturer's website and install the latest audio drivers available for your laptop or desktop computer. If you installed your computer yourself, download the audio drivers from your motherboard manufacturer's website. Updating drivers can fix your problem.
If you have problems with a USB microphone, you may also want to download the latest USB drivers from the computer manufacturer's website.
Double-checking physical connections
] If your microphone is not working, make sure it is properly connected to your computer. If the connection is a little loose, it may seem that it is plugged in, but may not work. Unplug the cable, whether it is a USB microphone or just a traditional audio jack, and reinsert it to ensure the connection is secure.
Make sure it is connected to the correct audio connector on your computer. Look for a marked "microphone" or at least "audio in". The output audio jacks are often green, while the microphone inputs are often pink. But sometimes they are just the same boring color.
Some microphones may have silencers. For example, we have seen PC headsets with microphone shut-off switches on their cables. The microphone does not work if it has an off switch that is enabled.
Use the Audio Control Panel
When you test the microphone, we recommend using the Recording tab on the Windows Control Panel. To open it, right-click the audio icon in your message area and select "Sound."
Click on the "Recording" tab and you will see all audio recording devices on your computer. Speak loudly and you will see the level indicator to the right of the microphone sending audio input.
Watch this window when playing with the microphone and testing different audio connectors. This will let you quickly see if the microphone sends audio input.
Set your default microphone device
Your computer may have several microphone inputs. For example, if you have a laptop with built-in microphone and you plug in another microphone, your computer now has at least two separate microphones.
To select the default microphone used in applications, go to Audio> Recording right-click on your desired microphone and select "Set as default". You can also select "Set as default communication device".
This allows you to specify different standard microphone inputs for different types of programs, but if you only plan to use an input device, set it as standard and standard communication devices.
If you see your microphone displaying audio input here, but you can not make it work in a special application, you may need to open the application's setup window and select the appropriate microphone input device. Desktop applications do not always use the default microphone you choose in Windows audio settings.
For example, in Microsoft Skype, click the menu> Settings> Audio & Video and select your favorite microphone device from the "Microphone" menu. 
Run Windows Troubleshooter
Windows 10 has a built-in troubleshooter that tries to find and fix audio recording problems automatically. To access it, go to Settings> Update and Security> Troubleshoot. Select the "Record Sound" troubleshooter, click "Run Troubleshooter" and follow the onscreen instructions.
If It Still Does not Work
If your microphone still does not work, there may be a hardware issue. For an external microphone, try connecting it to another computer and see if it works. If not, the microphone hardware may be broken.
If the microphone is working on a different computer but not on your current computer, there may be a problem with the computer audio jack. Try connecting it to a separate microphone input, provided you use a computer with audio connectors on the front and back.
Image credits: Tomasz Majchrowicz / Shutterstock.com, Alexander_Evgenyevich / Shutterstock.com.