You mentioned troubleshooting, did it include these:
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- OS X’s Disk Utility—which enables you to format, partition, repair, and perform other kinds of maintenance on disks (including SSDs, flash drives, and disk images)—is good for what it does.
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- Note: Disk Utility had a bit of a makeover in OS X El Capitan and as a result the way that you repair a disk has changed slightly. The steps you need to take will depend on the version of MacOS.
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.
Also, SMC reset may be needed (that usually doesn't fix a missing boot partition, though).
System Disk Utility 2.6.2 for Mac OS X Server 1.2 is a Mac OS program that allows you to select which hard disk your computer will start up from.
- 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.
Mac Os X Disk Repair Software Pc
Mac Os Install Disc Download
Refer to the following to see if it takes you anywhere you haven't been yet.
Mac Os X Disk Cleanup
Feb 10, 2017 3:37 PM