Hi,
Please do try these troubleshooting steps that may help in solving the issue.
- Start by uninstalling/reinstalling the sound card driver.
- Go to Device Manager and uninstall the sound card driver.
- Once uninstalled reboot your laptop and it should reinstall the driver automatically.
- After the reboot test weather the sound will work or not.
- If that doesn't work try to download and install the driver from Lenovo's Support site.
- Here's the link:
http
/support.lenovo.com/ph/en/products/laptops-and-netbooks/lenovo-g-series-laptops/lenovo-g570-notebook
- If all these will not work last resort would be running a factory reset.