If the laptop has buttons similar to those shown below, press the crossed-out speaker button to mute the laptop speakers.
Some laptops have buttons that control the audio. Some headphones and headsets have a button on the cord that connects in-between the headphones and the computer.
You can also look for a mute or power off button on your computer or the speakers as another alternative. Look for a sound icon and click the icon to either open the sound properties or mute the sound. If you only want to mute a movie, sound file, or audio in programs, most programs include a configuration option to mute the audio through the program or audio player. To un-mute it later, you can follow the same procedure. In the small window that appears, check the Mute box or click the sound icon (shown to the right) below the volume to mute the sound. In Windows, click the sound icon in the Windows Notification Area of the Taskbar that looks like a speaker. To disable the sound from the speakers or headphones, you can mute them (turn the volume off) or turn down (adjust) the volume. How to disable sound from speakers or headphones