Sometimes windows updates can update drivers along with system files update. Drivers can be installed with the latest version and won't sync with your hardware. This may cause [link|https://fixotip.com/lenovo-laptop-sound-not-working/|no sound from Lenovo laptop|new_window=true]. This is a very common and called driver's conflict issue in windows laptops. To fix this issue you have to reinstall the driver and check if is it working or not now.
* Right-click on the Windows logo key and go to Device Manager.
* Toggle down to audio inputs and outputs.
* Right-click and then Uninstall the device.
* Your driver device would uninstall.
* Now restart your laptop and windows will automatically install the right driver for the laptop.
If still the sound is not working then update the driver.
* Press the Windows logo and go to settings.
* Click on Update & Security and then windows update.
* Click on Check for Update.
* Windows will start checking and updating the driver.