So, I have a ROG G20 AJ that used to have a gtx 745. I upgraded it last November to RX 470. Ever since, the PC will get a black screen when playing games (ie the witcher 3) with audio for about 10 seconds, then nothing. I have to force turn off pc by holding power button. I have gone into wattman and lowered gpu usage, but still crashes, but not as often. i have upgraded the power from 180 watts to 245 watts as well.