Your monitor has a white line showing ? Either somethings wrong with the monitor or the video card. You can try shutting down and unpluging the computer , then removing the video card , then replace it and boot up to see if that made any difference. You can also unplug the monitor and diconnect the cable to the card and see if that helps. Then you can delete the drivers for the card and then reinstall them. You can also try loading windows in safe mode to see if the line is still there. You can see if the on screen adjustments for the monitor will make it go away.
At some point you will have to test the monitor on another computer to determine if it's the monitor or the video card.