the lines you see are probablly retrace lines due to the overly bright picture you say you have. On the monitor chassis look for the screen control on the flyback....you will need to remove the hard drive to get a good look at the flyback controls on the chassis. Turn down the screen (turn conterclock wise) and watch the screen till it looks good to you. The black areas should look black and of course white should have a nice clean whiite look as well. Good luck....