Hello, i have a problem where my screen shows a transparent grey wave moving up down only in the game background. This only happen when i playing a games. Especially when i be in the dark place in the game, the transparent grey wave can be seen clearly. For the information, i'm using the DVI to VGA cable to my monitor. My monitor do not have a port for HDMI and dvi. Is it the monitor problem or the graphic card faulty?