This link will direct you to a troubleshooting page that may address the issue that you are having with your Lenovo G70-80.
Background and Identification
The Lenovo G70-80 is a black laptop that was in circulation for about a year before being discontinued in early 2017. It has a 17.3" 1600 x 900 HD LED display with an 8GB system memory and 1TB 5400 rpm hard drive. It has a full keyboard along with a 10-key numeric keypad.
There is 1 USB 3.0 port, 2 USB 2.0 ports, an HDMI port, a headphone or microphone combo jack, and a VGA port. It weighs 6.5 pounds and is around 1.1" thin.