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famousringo said:
That really sounds like a hardware problem. Possibly the display, but more likely the video card. I hope your computer is on warranty, because there isn't much you can do except take it in for repairs.

Are the lines there all the time, or are they intermittent? Do they show up at startup?

The four lines are perminent. But the block shows at start up, then after a while it corrects itself.