I use a samsungy syncmaster 191t with a intel 845G MB that have a 64mb onbroad video card. Recently i discover the screen begin to flickering and appear to be flicker both horizontally and vertically but the flickering itself is not very serious although sometime it appear more frequent than other time. After tried to adjust the graphic property by choose different resoultion and refresh rate, the flickering still there, so i tried the screen on another computer and the screen work fine so maybe it is the video card has problem? thanks for any help.