Samsung Monitor Flashes Black and Analog Shows in The Right Corner

Ninjasty

TS Rookie
Hello , I am having problem
Problem starts randomly or when I start playing games . Monitor start turning black and analog shows in the right corner . And it drives me nuts because I'm very computer illiterate , plz help
 

Ninjasty

TS Rookie
Update
Everything worked fine for like one year until now , when I start pc everything goes fine and after few hours of gaming it begins .
am done help :(
 

Cycloid Torus

Stone age computing - click on the rock below..
Work through the video subsystem, replacing each element with known good. When the problem goes away, the last element you replaced was the broken one.
Monitor, cable, video card.