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Early 2011 model, A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor.

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High Sierra takes long time to install +16 hours

I wanted to install High Sierra on my macbook, but it only took 16 hours for the progress bar to be in the middle. Currently my macbook has no operating system on it. I tried internet recovery, no luck. I installed windows 10 and it took less than 10 minutes to install it and it runs normly, mouse pointer is not laggy at all..

Like everything is so laggy and slow when navigating through High Sierra installer. Yesterday I tried again, I downloaded high sierra from my brothers macbook and it got stuck on the part where I have to choose language, and of mouse pointer was so laggy!! I honestly don’t understand why

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1 Answer

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This is a common issue in this series! Most of the time its a bad HD SATA cable. You likely swapped out your HDD for a SSD which is good, but the original HDD was a SATA II (3.0 Gb/s) drive and the SSD you put in is a SATA III (6.0 Gb/s) but the original HD cable was only designed to support the slower drive. Apple also has a few issues with the cable as well so you want to make sure you get the newest version. The 2012 model cable is what you want MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable and here’s the guide you want to follow MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement

There are a few tricks here you also want to apply. First you want to place a strip of electricians tape on the uppercase where the cable crosses over to help protect it from the rough aluminum surface and you don’t want to crease the cable as that will also damage it! Instead get an old BIC pen and take the ink straw out using it as a form to roll the bends as it has the correct radius for the corner bends.

Here’s a bit more on the cable issue: Your Hard Drive Cable Is A Ticking Time Bomb

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


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


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Hello, first of all, I want to say thank you for replay and second of all, Yes I do have a ssd in it, true. But If I put back in a hdd, am I going to expect slow and laggy installation again or do I really need to replace the hdd cable? Because today I installed windows 10 on it, and installation went smoothly and fast, it took 10 minutes for win10 to install on my macbook and overall it's smooth, so is it really the problem with the hdd cable?


If you take the time and look through the questions for your system you'll find many others telling us the same.

I've fixed 100's yes that many! All of them sang after replacing the cable as I outlined and re-doing the format & OS install. If you want Windows then stick with it! If you want macOS you know what's needed.

While Windows appears to work its not going to be stable.


Well I do have a windows pc, so no need to have it on my macbook. But alright, if you say so. I'll try to update you in a few weeks. Thank you!


I got my hdd MacBook pro 2012 cable for my early 2011 and guess what, everything is still the same, laggy pre-instalation, laggy mouse pointer..


Yep that makes total sense as the older cable is only SATA II and you likely damaged it or got damaged.

Lets start again you need the BETTER cable MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable This is the 2012 version which is the BETTER Cable. Second you need to place a strip of tape on the uppercase where the cable crosses as outlined in Your Hard Drive Cable Is A Ticking Time Bomb and lastly you need to rolled the bends not crease it as that damages it! I use a BIC pen ink tube as a form to roll the bends so they have a nice radius.

OK, now that the hardware is fixed you still need to reformat your drive and install a fresh copy of your macOS.

We've collectively done tons of these, I can tell you I for one have done at least 250 systems like yours with the exact same symptoms! Everyone was working and screaming in speed!


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