In the Properties window which opens, check under Device usage and set the option to Use this device (enable) if it wasn’t already and apply the changes. Click on it once and click the Properties button at the lower right part of the window.It should be located at the top and be selected. Switch to this tab by clicking at the top of the window and locate the Microphone you are using. Check to see if your microphone is enabled under the Recording tab.If this icon is not located at your taskbar, you can locate Sound settings by opening Control Panel, switching the view to Category and selecting Hardware and Sound > Sound. Right-click on the volume icon located at your taskbar and choose the Sounds option.Also, this can fix the problem if there are other similar tools installed on your computer which might try to access sound devices at the same time as Audacity.

It’s possible that one of your core sound devices may have been disabled by a program or by a new Windows Update. Further Troubleshooting for Windows 10 and Older Versions of Windows

Audacity for chromebook