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hey guys today I shocked when I cleaning my MacBook Pro 2011 13inch , I find that my Back cover Display Housing Popping off from his place ?!! I never made any repairs on my Mac or on the display ! so how I can fix it pls ?!

Your glass may just be coming loose. Here’s how to replace it, you may just need to re-adhere it.Once you have the glass off, take a loo at the frame, these have been know to crack in the lower left hand corner about and inch up from that corner. If this happens it allows the display to flex on opening and closing and allows the glass to pull loose. I use an epoxy to repair this damage MacBook Unibody Model A1278 Front Display Glass Replacement

If I were you I would just replace this so it doesn’t give you fits in the long run. There is an iFixit guide and a new display assembly stocked by iFixit too. You can find the display assembly part under the parts section in the guide I will provide below. Hope this helps. MacBook Core 2 Duo Unibody Display Replacement