El capitan reinstall without losing data?

I bought a used MacBook Air and El Capitan is installed.  There are funny behaviors and I want to see if a reinstall will help.  How can I reinstall the El Capitan withouth losing my data.

Thank you

David

Reinstall El Capitan without erasing the drive

HD recovery start: restart the computer after the ring, press on and hold down the COMMAND and R until the menu screen appears.

Repair the hard drive and permissions: at startup, select in the main menu disk utility. Repair hard disk and permissions as follows.

When the recovery menu appears, select disk utility and press the continue button. Disk utility charges and select Macintosh HD entry indented from the list on the left.  Click first aid button in the toolbar. Wait until the operation is complete, then quit disk utility and return to the main menu.

Reinstall OS X: Select reinstall OS X and click on the continue button.

Note : You will need an active Internet connection. I suggest to use Ethernet if possible because it's three times faster than Wi - Fi and more reliable.


Tags: Mac OS & System Software

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