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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 37,199
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 4, 3 iPods, OS X 10.9.2

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Go to iFixit: The free repair manual and look up the take apart instructions for your model MacBook. It may be a pinched or loose cable. This problem occurs on MacBooks and MBP machines as they get older primarily because of the many times the lid is opened and closed or opened too far back past 90 degrees.
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