I am having a problem with my monitor. The icons on the screen vibrate and the sides of the monitor screen start comming in at about the middle. It does this and then goes back to normal. I would like to know if there is an adjustment or I need a new monitor. I have adjusted with the monitor controls on the front of the monitor and they still work but no help. It is a Copaq MV 520 amd it is about 4 years old.