All volume is not working

@tsegabyemedu could be an issue with the audio card or could be an issue with your OS. What OS you are using (I assume Windows). Check in our device manager and see what it tells you for the Sound options. I would start by reinstalling your audio driver.

You can download the Maintenance and service guide for your computer from here as well as the user guides depending on your version Windows version on here

You will get the drivers for your computer from here

Let us know what happens after you do this.