text: One of the electron guns in your CRT has failed and you're only seeing the image produced by the other two electron guns. \n\nThere's nothing you can do unless you are professionally trained to repair monitors. Do NOT even ATTEMPT to take apart a monitor. Touching the wrong parts inside can KILL YOU, even without it being plugged in. I am NOT joking. \n\nWith CRTs so cheap nowadays, it would be virtually pointless trying to repair them. Just get another monitor.