I built a computer for myself and didn't notice the following issue up until weeks after so I can't say if it as been there since day one or it appeared at some point of time afterwards.
What it is is that when I play a game or move the screen up and down or from side to side with the scroll bars, there is always a horizontal bar of pixels that split my screen in two and makes the displayed moving image off at that level, It seems to be always about 1/3 off my screen starting from the bottom but I believed I seen it be in the upper part as well. The effect it as is like if you would cut the screen where the line is and slide one part 1 milimeter to the left or the right. When the screen is still (i.e. no movements) there is nothing wrong in the display.
Would someone know what this is ? would it be the monitor or would that be coming from the desktop computer tower hardwares, for example, graphic card or even the connected cables.
I use DVI connection.
Here is a link to a video that shows what i meant to explain :
It is called shearing . Its caused by the refresh rate of your graphics and monitor , they are not syncing . As previous posters have said , changing the refresh rate on your monitor should cure the problem . The monitor is not broken .