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What you need to reinstall macOSĪ back up: If you are planning to wipe your Mac as part of this process (either because you think that a clean slate might fix issues you are having, or because you are selling the Mac) you may want to back up your important documents first.

Mac os x utilities cannot reinstall new os x install#

If your Mac doesn’t boot in Recovery mode, read this:Ĭlean install of macOS using a bootable drive.

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Because macOS is normally installed via Software Update (or previously the Mac App Store) there are no physical installation disks, therefore Apple has made it possible to install the operating system over the internet using the Recovery HD.Ĭreate a bootable macOS install on an external drive. Select a tool and click Continue to perform the desired function.Using the Recovery partition via which you can reinstall the latest version of the macOS you installed on your Mac.

Mac os x utilities cannot reinstall new os x mac os x#

Once you have done this you will be taken to the Mac OS X Utilities screen shown below.

Upon startup, press and hold the option key until you see the Apple logo.

Upon startup, press and hold the command key and the R key until you see the Apple logo.

There are two ways to access the Recovery HD: You must have internet access to use this function.ĭisk Utility: This option will open your Disk Utility, and will allow you to check, repair, erase, or partition your hard drives. Get Help Online: This option will direct you to the Apple Support website.

IMPORTANT: Reinstalling the OS will erase all data on your hard drive.

Due to the size of the operating system this process can take several hours. However, to fully reinstall Lion you must be connected to the internet because the operating system files and data have to be downloaded.

Reinstall Mac OS X: This option will start the Lion installer.

Note: In order to use this function you must have a complete backup, including system files, saved on your Time Machine.

Restore From Time Machine Backup: This option will allow you to restore your entire system, including the operating system, all accounts, user data, and settings, from a Time Machine Backup.

The Recovery Partition provides the following options: DoIT assumes no liability for data loss that occurs as a result of this procedure.

Please contact the manufacturer or system developer for help.ĬAUTION: Please make sure your important data is backed-up on an external storage device (such as a CD, DVD, or external hard drive) before attempting this procedure. These instructions are provided for self help purposes only. NOTE: These procedures are not supported by the Help Desk. Recovery Partition - OS X 10.7 and Higher Generally, since the directory check occurs during the gray startup screen, you can reboot immediately after logging in. To return to a normal boot, simply restart the computer without holding any keys. While a Safe Boot can be helpful for troubleshooting, many services will be unavailable - specifically audio and network devices.

In Mac OS 10.4 or later, you will have to login to your account, even if it normally does so automatically.

Note: Startup will likely take substantially longer than normal.

Once the gray Apple and progress indicator appear, release the Shift key.

Immediately after the startup chime, press and hold the Shift key.

10.4 or later: Disables all startup and login itemsĪ Safe Boot can potentially repair problems that prevent Mac OS X from starting properly.

10.3.9 or earlier: Disables all non-Apple startup items.

Load only the required kernel extensions.

Force a directory check of the startup volume (as Disk Utility's Disk Repair).This can help to troubleshoot startup problems when an OS installation disc is not available.Ī Safe Boot will perform the following tasks:

Mac os x utilities cannot reinstall new os x how to#

This document explains how to perform a Safe Boot in Mac OS X 10.2 or later and how to boot into the recovery partition for OS X Lion.