Apparently, you don't like following directions.
Repair the Drive for El Capitan or Later
- Restart the computer and after the chime hold down the Command and R keys until the Apple logo and progress indicator appears.
- Wait until the Utility Menu appears.
- Select Disk Utility and press the Continue button.
- Then select the out-dented (usually, mfgr.'s ID and drive size) drive entry from the side list.
- Click on the First Aid tab in the toolbar and wait for the Done button to activate. Click on it.
- Click on the triangular gadget in order to enlarge the panel and see if the issue was repaired.
- Select Restart from the Apple menu.
If the above does not repair the partition map, then you should consider repartitioning and reformatting the drive. Be sure you backup first.
Internet/Network Recovery of El Capitan or Later on a Clean Disk
- Restart the computer. Immediately after the chime hold down the (Command-Option-R) keys until a globe appears.
- The Utility Menu will appear in from 5-20 minutes. Be patient.
- Select Disk Utility and click on the Continue button.
- When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.
- Click on the Erase tab in Disk Utility's main window. A panel will drop down.
- Set the partition scheme to GUID.
- Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
- Click on the Apply button, then click on the Done button when it activates.
- Quit Disk Utility and return to the Utility Menu.
- Select Reinstall OS X and click on the Continue button.
Note:
1. To install the version of OS X that was currently installed use Command-Option-R.
2. To install the original factory version when the computer was new use Command-Option-Shift-R.
