On Windows 10 system, you may get the error message “No Audio Output Device is Installed” after plugging in a headphone or earphone to your computer. This indicates that there is no audio driver installed on your system and hence there would be no sound coming out through the headphone.
If the “Realtek High Definition Audio” is not detected on your system or does not work properly, you need to download and reinstall the “Realtek High Definition Audio Driver”. If there was no audio driver installed previously on your Windows 10 PC, it would show an error message that “No Audio Output Device is Installed”.
Note: You can download and reinstall the audio driver even if Windows 10 fails to detect the audio device. Follow the steps below to fix this problem.
How to Download and Reinstall Realtek Audio Driver on Your Windows 10 PC?
Step 1: Go to the manufacturer’s website, and download and install the latest Audio Driver on your computer.
Realtek Downloads: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false#AC
Step 2: After downloading the driver, restart your computer to activate the newly installed audio driver.
Step 3: If your headphone or earphone still does not work properly, you need to troubleshoot Audio Driver problem on Windows 10. You can go to this page for more information: https://support.microsoft.com/en-us/help/942799/how-to-troubleshoot-sound-problems
Note: The steps above are for Windows 10 operating system. If your computer runs on Windows 8 or 7, you can follow similar instructions to download and reinstall the realtek audio driver on your computer.