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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,392
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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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I can't quite tell from your included pictures, but it looks like some sort of interference. Do you have external speakers attached to the iMac which might be close to the LCD?

Try moving your iMac to another location and see if you get the same thing on the screen. If you do and it's not from interference, I would take it on in to your local Apple store and have them look at it.

Regards.
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