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I have a MacBook Pro 13 inch, mid 2012 2.5 GHz Core i57 series chipset I want to install a new 512 GB Samsung 850 PRO SSD which I bought. I tried many times to replace it to my current HD but the SSD is never detected by the system. So I thought the SSD was damaged but I got it checked by the seller and they said is not. I put back my old HD instead and it is working fine. Would you say then it is related to the cable? I already replaced the flex cable not long ago with a NEW HDD Hard Drive Cable 821-2049-A for Apple MacBook Pro 13" A1278 2012 … Thank you for attention
You installed the older cable! I would install the newer version MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N 923-0104. I would start there. Update (02/20/2018) What did you connect your new SSD into? A MS Windows system, or, a Mac to test it. Lets try connecting the SSD externally using a SATA to USB connection to a working Mac System so we can prep the drive externally. Here’s one adapter: Startech 2.5" SATA to USB adapter Here’s a good reference to prep the drive: [osxdaily.com/2012/01/04/format-an-external-hard-drive-or-usb-flash-drive-for-mac-os-x/|Format an External Hard Drive or USB Flash Drive for Mac OS X]. We want to make sure there is only one partition on the drive and that needs to be GUID/MAC OS Extended Journaled. If you have a friend with a Mac have hime help you create a USB OS Installer drive. I would recommend sticking with MacOS Sierra with a SATA SSD Apple still has some issues with queueing which I’m hoping will be fixed soon. Here’s a good write up to walk you though it: How to create a bootable macOS Sierra installer drive. Now plugging both the new SSD and the OS installer to your system you should be able to see and install the OS onto your new SSD. Make sure you it boots up on its own and then plug it back in internally. You should be working now. If not you might have a bad cable or damaged it some how.
