Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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My 1TB Samsung 850 EVO Fails to boot internally

So, about a month a go i bought a Samsung 850 EVO (1TB) . Suddenly my new SSD starts to boot very slow and at some point will freeze up my laptop. Upon research, i manage to find a way to boot it up with via usb with this https://www.startech.com/HDD/Adapters/US.... and works perfectly. But when i place it in internally it won't boot up. Any Help?

Thanks.

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Probable bad hard drive cable. Replace with a new one from the 2012 13" model. Buy a new cable only!

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable Image

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Many thanks @mayer But do i need to buy with bracket?

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No you already have the bracket. You just flip up the cable lock on it, use a pocket knife to unstick the board and replace it.

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Sena Dzameshie will be eternally grateful.
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