I recently purchased the LG 27ud68-w and it works fine except when trying to play video games. Regardless of if the game is on that display or my other monitor the LG monitor flickers. I have tried with multiple display port and HDMI cables and the problem persists. I saw online that changing the pixel format from RGB to YCbCr could help and it resolved the problem for one game I tried, but not all. Any ideas on what could be the problem? Thanks.