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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,853
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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Let's test it: Take a screen shot of your desktop. If the screen shot shows the same dark top and light bottom, the fault is probably with the graphics adapter. If the screen shot shows normal, then the fault is likely the LCD display itself.
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