You mentioned troubleshooting, did it include these:
If you have problems copying files from your MacBook or MacBook Pro onto an External HDD (hard drive). I think this is the first time you are trying to pair this External HDD with your Mac. If yes, your solution is easy. This article will guide you to Fix unable to Copy MacBook data to External HDD. Fix unable to Copy MacBook data to External HDD. My mom recently dropped a heavy box on my MacBook Pro (late 2011 model running on Yosemite) My laptop is over 4 years old and its 500GB hard drive got bad sector (resulted from a physical damage). I know hard sectors cannot be repaired unlike soft sectors.
NVRAM reset
Shut down the MacBook Pro. Start it and immediately hold down Command, Option, P and R keys at the same time. Wait until you hear the startup chime for the third time before letting go.
Macbook Pro 13 Hard Drive
Also, SMC reset may be needed (that usually doesn't fix a missing boot partition, though).
- Shut down the computer.
- Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
- On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- Press the power button to turn on the computer.
Restart and hold down the D key to enter the Hardware Test. Follow the instructions.
When booted externally, use Finder's Go menu to open Utilities. Launch Disk Utility and look for any signs of your internal drive in the list of hard drives on the left. If you find it look for First Aid and try to use it on the disk.
Macbook Pro Hard Drive Cable
Refer to the following to see if it takes you anywhere you haven't been yet.
Feb 10, 2017 3:37 PM