Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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Why sometimes does my mac lag even after fresh install OS-X

Hello everybody,

I need help about my mac. The problem is my Mac seems to be lagging, I often encounter the spinning Colored beachball often shows up even when I'm just opening the Finder only. But when I don't do anything its fine, the problem shows up mostly when I'm copying data it will stop for sec then the process will continue again, I already installed a fresh copy of the OS-X and nothing changed, I also checked the disk with Disk Utility and any other software it seems fine,

Sorry for my bad explanation,


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A common problem is the drive cable gets worn so the drive & CPU have a hard time talking with each other which is why you see the beachball.

You'll need to first make a backup of your drive so you don't loose anything. Slowly copy off folder by folder as a you don't want to over stress the system. Once you've copied off your stuff try making a TimeMachine backup of just your OS & Apps. It may fail, and you'll then need to reinstall your apps after we fix things.

OK, you'll need to follow this IFIXIT guide: MacBook Pro 13" Unibody Late 2011 Hard Drive Cable Replacement but you really want to use this part: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N 923-0104 as Apple improved the part in the newer model.

Once you've replaced the cable you'll need to reformat your drive and install a fresh copy of OS as often the OS is damaged on your HD from the problem. Follow this guide to create an OS installer drive: How to create a bootable macOS Sierra installer drive. Then run TimeMachine to install your Apps and copy back your stuff.

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


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


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