Let's try these steps in order to fix the audio problem on your lenovo laptop. (1) Try to connect a external speakers or earphone into your computer and then play an audio let's see if you can hear any sound or not? (2) Uninstall the audio driver completely and reboot your computer. (3) If you find multiple audio drivers into your computer, you need to uninstall all of them and try to install the latest driver into your computer. (4) Still going throughlenovo laptop sound not working problem? let's restart the windows audio service. (5) After doing all these instructions, if your computer is still not working, you should try to factory restore your computer to the back date, when your computer was working fine.