Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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Kernel Panics and booting problems.

I own MacBook Pro mid 2012 system.

A few days back my MacBook Pro has started to freeze during startup and then ultimately it completely crashes.

I replaced the HDD and checked for a bad RAM module but everything seemed OK. Also when I touched the area around HDD it caused the machine to freeze.

Please help me with this problem.

Thanks in advance.

Answered! View the answer I have this problem too

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I suspect your drive cable is bad. Apple had a bad run of cables for this system. Here is the part you will need: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable. Here's the guide you'll need to follow: MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement.

I also suspect your original drive is OK. So you might want to see about returning your new drive unless you also wanted to get a bigger drive and that is why you replaced it to start with.

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

Product

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

$44.99

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Apple has recognized this to be a valid problem in this particular make and model of MacBook. Before you go and spend money on buying a new cable, take it to an Apple Retail store or an authorized service provider. Even if your Mac is out of warranty, it is still worth a try.

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Could you give us a link to this recognition, I have not seen it yet?

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Hi! Most likely this machine behaviour ist caused by a faulty GPU. https://www.apple.com/support/macbookpro...

If it was the cable, there would be a grey screen only and the MBP would boot from your hard drive being used externally via USB / FireWire.

Kind regards

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I disagree vehemently with your statement of there just being a gray screen with the bad cable. I have seldom see this with a defective cable. Please back this conclusion up with documentation.

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Hi mayer! Those are my experiences over last 2 years. Grey screen as long as the HDD was inserted. Booted as soon as I used it externally via USB / FW. Changed the cable, no problems.

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Hi! I am having this problem after changing my cable with one from iFixit; same thing that Alexander is reporting, and waiting for the next cable to confirm that it was the issue.

Unfortunately the iFixit spare broke after 2 weeks of use. I am using a caddy arrangement with HDD/caddy in the SuperDrive bay + SSD in the main bay

Macbook Pro 13" Mid 2012 (2014) i7

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I've had this problem and swapping out the ram sticks was my answer. It might be worth a shot.

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Saurabh will be eternally grateful.
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