I just recently (2-3 weeks) built a computer. I am running a dual monitor system on windows 8.1 pro, and when i play league of legends my primary screen flickers from dim to bright. It only does it while playing league and it is driving me nuts. I have tried changing my video settings, from low to high, and turning on and off v sync and anti aliasing. It only happens when i play league and I've checked their forums to see but i didn't find anything on it. I'm stumped and wondered if anyone here had any insight as to what it could be.