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

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MacBook sometimes don't recognizing hard drive(s)

Hi!

I bought a faulty Macbook Pro 2012 13’ and it has a weird problem. It can boot normally, and when it does everything works. However, sometimes when it starts it only shows a blank white screen and the hard drive don’t show up when I start with option key. I even tried to boot from the opticaddy and it’s the same there. So it’s seem unlikely that the problem should be a faulty hard drive cable.. The previous owner said that the computer boots normally after a while when the componets have cooled down, and he seems right about that.

I’ve tried to install a new Mac OS on one of the hard drives, but it got stuck multiple times during the installation so in the end I couldn’t finish it.

Can it be something else than a faulty logic board? I could of course add cooling paste and clean the inside, but I’m not sure it would matter? I’ve tried to reset SMC and NVRAM.

Thanks!

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You’re facing a common issue do to a bad HD SATA cable! Your Hard Drive Cable Is A Ticking Time Bomb. I strongly agree the strip of electricians tape is important on the uppercase to prevent the rough surface from damaging the cable.

You’ll need to replace it and make sure you put in the newest version of the cable which is this one: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable and here’s the guide MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement

You also need to be careful with it as often I find people damage it in the process of putting it in. Don’t bend or crease it! Instead use an old BIC pen ink straw as a form to curl the cable where it needs to be bent around a corner. You want the curve to not exceed the radius of the straw.

Now after replacing the cable make a TimeMachine backup of your drive make sure its good ad you’ll need to wipe the drive (format it) and install a fresh copy of your MacOS and restore your stuff as you likely have a fair amount corruptions on it.

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

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

$34.99

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Thanks for your answer Dan! So you think it’s the hard drive cable even though I have the same issue when i put the boot drive in the opticaddy? Does the hard drive cable also affect the optical drive cable? Sounds messed up! Haha.

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Moving the drive around doesn't alter the fact the cable likely messed up your drive from the start. Thats why you moved it correct?

To add to it when you moved the drive to the second SATA port you likely didn't bless the drive as being the boot drive in that bay. Remember! The Startup drive setting in your preferences dictates that or you need to leverage the startup command Option (⌥) to get access to the startup manager to then select it. And then alter it in the preference setting.

Reference: Mac startup key combinations

As to using the optical bay other than a SSD I wouldn't use it for a HDD as the optical bay does not offer crash guard protection that platter HD drives require.

You may still need a new drive here.

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Ok thanks! To clarify I first tried to boot with a SSD in the main hard drive bay, but as that didn’t work I put it in the optical bay. As that didn’t work either I found an old mechanical HDD wich I put in the main bay. So I’ve two drives connected as we speak.

After your reply I disconnected the hard drive cable and just started with the option key to boot from the SSD in the optical drive. The Macbook found the SSD but it didn’t boot up (loaded full but nothing happened). When I restarted the drive didn’t even showed up.. So now I’m really confused haha.

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@petree - SSD push the limits of the SATA III 6.0 Gb/s connection.

As a matter of course I always replace the SATA cable when I put in a new SSD as the original SATA cable can't support the full I/O the SSD can push.

So Yep you need a new SATA cable (current rev) and you need to be careful as any damage to it will also effect its through put. The older cables where designed to support SATA II drives.

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@danj Ok! I tried to place the mechanical HDD in the optical caddy and it worked perfectly! No issues. Now I'm going to buy a new SATA cable and the computer is fine. Thanks for your replies, I really appreciate your work here Dan :)

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