Can a monitor stop working without any warning? My mom was using my dad's computer and left for about an hour to go do something else. When she returned to the computer, the monitor was black with blinking white lines through it and the power button on the monitor was blinking green. Nothing I did helped the situation and I can't figure out what to do, other than purchasing a new monitor, but even I don't know if that will work. It seems like everything else is working fine, except the monitor. Soooo...suggestions?