Why did my monitor start flickering out of no where?

wbake28
wbake28 Member Posts: 1 New User
I started playing League of Legends last night and sometimes my monitor turns like green and starts flickering out of no where. It isn't the laptop I'm using as I have tried using another laptop and the flickering didn't stop. It isn't my HDMI cord either as I tried another one, someone said try change the refresh rate higher but my only options are 40hz and 60hz even though I'm on a 165hz monitor. Please help. 

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