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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,639
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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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Which iMac do you have? Year and model? Version of OS X?

The uploaded pictures show that it could be a defective display (LCD) or the graphics card. You can try attaching an external monitor to the iMac to see if the results are the same or not. That would eliminate either the display or graphics adapter.
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