problema macbook

Reinstalling while keeping files, applications, and settings
    Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
    If prompted, select your main language and then click the arrow.
    Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
    When the installation is complete, select App Store... from the Apple menu, and install any available updates.
Reinstalling while erasing everything on your computer
    Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
    If prompted, select your main language and then click the arrow.
    Click Disk Utility, and then Continue.
    In Disk Utility, from the left column, click your hard disk. Select the Erase tab.
    Next to "Format:", make sure Mac OS Extended (Journaled) is selected. Next to "Name:", give your disk a name.
    If you would like to securely erase your data, click Security Options..., adjust the slider accordingly, and click OK. When you're ready, click Erase..., and then Erase again to erase your disk. When the process completes, quit Disk Utility.
    Click Reinstall OS X, and then Continue. Follow the instructions and then choose your hard disk. Click Install and enter your Apple ID information if prompted. Once the installation is complete, you'll be asked to enter basic information and have the option to transfer data from another computer or a backup.
    Select Software Update... from the Apple menu and install any available updates.
This is document bcnk in the Knowledge Base.
Last modified on 2018-03-05 16:33:47.