Mac Re-install the OS

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External

Internal

Re-install with Data Deletion

Control + R while restarting -> OS X Utilities

First delete the partition from Disk Utilities, then "Reinstall OS X". Reinstalling without explicit deletion will upgrade and preserve the data.

The computer must be connected to the Internet (wire or wireless): Utilities -> Network Utility.


Command + R while restarting.

Re-install without Data Deletion

Create a Bootable USB

https://support.apple.com/en-us/HT201372