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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 40,898
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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The next time it happens on her machine, ask her to take a screenshot of it. Let us know if the screenshot shows the same thing or not.

Very briefly, if the screenshot shows a normal picture, it's either software or the LCD itself that may be the problem. If the screenshot shows the same thing, it may be a graphics defect.
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