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Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB DDR5 Video RAM

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Will no longer boot past white screen

OK, so this A 1286 2012 first started to have issues only when cold. Now it does not go beyond white screen, even when it is at normal room temp. I tried the usual SMC and PRAM, at one point it even booted into recovery after the PRAM reset . There I looked in Disc Utilities, and did NOT see the internal HDD represented at all. So I installed a known good SSD drive with Mojave on it ( same OSX as was on the native SSD) and still not going past chime and then white. I can do some very entry level logic board repair, and have the schematics and .brd files and scope, but could use a few pointers, or just one effective one. Anyone? Cheers, Jurgen

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@jurgenkoppen - I don’t think you need to get into the logic board to fix this. I think you have the classic case of bad HD SATA cable! If I understand correctly you can boot the system up, just not with the internal drive (which ever you put in)

So you’ll need a new cable MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable and here’s the guide to put it in Remplacement du câble du disque dur/capteur IR du MacBook Pro 15" Unibody mi-2012. Don’t get the wrong cable! There are a few versions and I only recommend the newer version.

What I also strongly recommend is to place a strip of electricians tape on the uppercase where the cable rests Your Hard Drive Cable Is A Ticking Time Bomb

A second issue is the mid plane clips tend to break! If one is good move it over to the optical drive side.

Block Image

If you don’t have a good one place strips of foam tape as shown here to protect the cable from damage so the bottom cover can’t hit it.

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The last issue is not damaging the cable when you install it, I often find people damage the cable by creasing it where the cable needs to bend around a corner. Don’t do it! The thin foil wires are easily damaged! I use an old BIC pen ink straw as a forming break so I can bend the cable in a nice arc so the cable has no sharp bends.

You will want to reformat the drive as its likely you have some corruptions and then re-install the OS. That should do it!

Image MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable

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MacBook Pro 15" Unibody (Mid 2012) Hard Drive Cable

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Jurgen sera éternellement reconnaissant.
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