Whitish grey water mark that only appears on black backgrounds. [Closed]

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Registration date
Friday October 18, 2013
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October 18, 2013
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I foolishly let my sister see my computer and can't for the life of me figure why I now have a white/grey water mark that always appear on black backgrounds when off or on a colorful background no issue. Please, what's the problem and solution. Computer is a HP Pavilian D7 17 in.