No Sound, Error ! Failed to play test tone on windows 7, 8 10
Sound Won't Work on windows 7 8 and 10
Many users face this issue while working on windows machine. We are showing you few options which might resolve your windows machine sound issue. You can try any of the below on your machine and let us know in comment section if it work for you so that it will help others-

Option 1

Go to your machine sound panel - either by control panel or type sound on start. Select your computer speaker and click on properties and then select advanced on next dialog box- Select "restore defaults"- Apply

Try this, it worked for many and may help you. See below

Option 2

Open command prompt - (run as admin) and type command

sfc /scannow. This will take some time and then you can reboot and check your computer speaker volume. See below -

sfc /scannow

Option 3

Go to your computer BIOS and enable Onboard audio if it is not enabled.

Option 4

Go to Start -> Run -> services.msc

In "Services" window, select Windows Audio and restart this service.

Option 5

Go to your machine sound panel - either by control panel or type sound on start. Select your computer speaker and click on properties and then select "enhancements" tab - > now click "Disable all Sound Effects" - >Click OK and apply
Try your sound now.

Option 6

If none of above work then you should remove your sound device driver and install latest drivers