I have a thin horizontal line running across my screen about 1/4 of the way from the bottom of the monitor. Why is it there and how do I get rid of it?

There is a thin horizontal line running across the width of my screen about 1/4 of the way from the bottom. This line, along with an occasional vertical line about a 1/3 of the way from the right side of my monitor, started appearing about 7 days ago. Usually the line would disappear after a restart but now it seems intent on staying. Does anyone know what is going on and how can I resolve this?

Contact Apple's Support, formerly Apple Express Lane.

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