Question Vertical lines that appear after running games

Feb 6, 2020
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My laptop has 4 vertical lines that appear when i run a game. Initially, there was only 1 line, but after a while 3 more appeared. They start off faint, but the longer i run the game the more obvious it becomes. 2 lines are at the edge of each side of the screen and another 2 are about 3 inches from each side of the screen. If i leave the laptop idle for about 20mins, the lines fade away. Does anyone know if this is a display cable issue or is it the display itself?
 
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