I'm using a Lenovo Legion Y530 laptop and a hdmi cableWhat kind of laptop and cable are you using to connect to the monitor?
Probably the HDMI port/output dones't support refesh rates over 60Hz.So i have a laptop with a ASUS VG278 monitor and every time that i try to set the refresh rate of the monitor higher than 60hz it displays horizontal red lines all across on my screen. help pls