How long have you bought your notebook? There is a serial number at the bottom of your machine. This is the host number of your machine. Use this number to associate official website/Lenovo /WSI/modules/new xpz. html? Check the warranty date of the machine. If it is still under warranty, just go to Lenovo customer service for repair. If it is out of insurance, go to the surrounding computer repair shop to repair it. I hope it will help and be adopted. Thank you.