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My mid-2012 MacBook Air has a spot on the bottom plate. The computer has never been dropped. Does anyone have any idea what could cause this?

Wear Spot

  • It could be a bad battery cell that has expanded and pushed the bottom of the case out just enough to scrape. – Dillon Aug 14 '14 at 14:29
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I took the computer in to Apple, and they determined that the spot was the result of a bulge caused by a piece of foam on the speaker. They told me that the foam and its attached components were the wrong parts.

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Is that circle actually there in real life, or did you add that to highlight the mark? The scratch could be caused by something as simple as some grit on a table. The feet on the air doesn't keep it very far off a surface, so just sliding the laptop with some grit could do that.

  • The circle is part of the wear. – Alex Volpe Aug 17 '14 at 21:35

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