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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Folder With "?" Mark Into Apple Logo Into Circle With Line & Repeat

Put a new reformatted SSD in, which I installed High Sierra onto from another MacBook. Initially it worked, but after I restarted it I am getting the Folder With "?" Mark Into Apple Logo Into Circle With Line & Repeat. What is going on?!

Command R button results in just a white screen. Doing option and choosing the recovery drive results in the same problem as the first paragraph.

This is a MacBook Pro 13-Inch "Core i7" 2.9 Mid-2012.

Thank you!

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Did you change the HD cable? You can’t ever trust the factory ones on these with SSDs - the rough chassis wears them out and the SATA II/III lottery makes it so you don't know if it'll work. It's better to replace it with a known compatible cable that's SATA III ready. Get a new cable for the machine and that always cures these issues. Refer to this guide for a replacement and install instructions.

Patch the cable using my instructions on this post before installation.

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3 Comments:

It would seem you're right. The SSD hard drive came with a port to use it as an external hard drive. This configuration works. Must be the cable! Thank you!!!

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@jesusisnumbah1 It's *always* the cable. Unless it's a rare board issue, the cables always seem to act up when you install an SSD.

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You da man Nick!!

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