Quick Answer: How To Do A Clean Install Of Mac Os X?

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Step 3: Erase your hard drive

Connect your Mac to the internet via Wi-Fi or Ethernet.
Click on the Apple icon.
Select Restart from the drop-down menu.
Hold down Command-R when you hear the startup chime (or the screen turns black on newer Macs) and keep holding the keys until your computer reboots.

How do I do a clean install of OSX?

So, let us begin.

Step 1: Clean up your Mac.
Step 2: Back up your data.
Step 3: Clean Install macOS Sierra on your startup disk.
Step 1: Erase your non-startup drive.
Step 2: Download the macOS Sierra Installer from the Mac App Store.
Step 3: Start the Installation of macOS Sierra on the Non-startup drive.

How do I do a clean install of Mojave on Mac?

3: Create a bootable macOS Mojave installer

Download new macOS from the App Store.
When it’s finished, the installer will launch.
Plug in the USB stick and launch Disk Utilities.
Click the Erase tab and make sure Mac OS Extended (Journaled) is selected in the format tab.
Give the USB stick a name then click Erase.

How do I wipe my Mac and reinstall?

Select your startup drive on the left (typically Macintosh HD), switch to the Erase tab and choose Mac OS Extended (Journaled) from the Format drop-down menu. Select Erase and then confirm your choice. Quit out of the Disk Utility app, and this time choose Reinstall OS X and Continue.

How do I do a clean install of Mac OS Sierra?

Restart and Install

Use the mouse pointer or the arrow keys on your keyboard to select the disk called “Install macOS Sierra” in the drive list that appears on the screen.
Once the USB drive has booted, select “Disk Utility” from the Utilities window, choose your Mac’s startup drive from the list, and click “Erase”.

How do I reinstall OSX?

Step 4: Reinstall a clean Mac operating system

Restart your Mac.
While the startup disc is waking up, hold down the Command+R keys simultaneously.
Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac.
Click on Continue.

How do you run a clean install of macOS High Sierra?

How to Perform a Clean Install of macOS High Sierra

Step 1: Backup Your Mac. As noted, we’re going to completely erase everything on the Mac.
Step 2: Create a Bootable macOS High Sierra Installer.
Step 3: Erase and Reformat the Mac’s Boot Drive.
Step 4: Install macOS High Sierra.
Step 5: Restore Data, Files and Apps.

Does installing Mac OS Mojave delete everything?

The simplest is to run the macOS Mojave installer, which will install the new files over your existing operating system. It won’t alter your data, but only those files that are part of the system, as well as bundled Apple apps. Launch Disk Utility (in /Applications/Utilities) and erase the drive on your Mac.

How do I reinstall Mojave on Mac?

How to install a new copy of macOS Mojave in Recovery Mode

Connect your Mac to the internet via Wi-Fi or Ethernet.
Click on the Apple icon in the upper left corner of your screen.
Select Restart from the drop-down menu.
Hold down Command and R (⌘ + R) at the same time.
Click on Reinstall a new copy of macOS.

Does installing Mac OS delete everything?

Technically speaking, simple reinstalling macOS won’t erase your disk either delete files. You probably don’t need to erase, unless you’re selling or giving away your Mac or having an issue that requires you to wipe.

How do I reinstall Mac OS without recovery mode?

Restart your Mac while holding down the ‘Command+R’ buttons. Release these buttons as soon as you see the Apple logo. Your Mac should now boot into Recovery Mode. Select ‘Reinstall macOS,’ and then click ‘Continue.’

How do I start my Mac in recovery mode?

How to enter Recovery Mode. 1) In the Apple menu choose Restart, or power on your Mac. 2) As your Mac restarts, hold down the Command (⌘) – R combination immediately upon hearing the startup chime. Hold the keys until the Apple logo appears.

How do I wipe my Mac?

How to Wipe a Mac Hard Disk Drive (HDD)

Make sure your Mac is turned off.
Press the power button.
Immediately hold down the command and R keys.
Wait until the Apple logo appears.
Select “Disk Utility” from the OS X Utilities list.
Select the disk you’d like to erase by clicking on it in the sidebar.

How do I restore my Mac to factory settings?

Step-by-step Guide to Reset Mac to Factory Settings

Restart in Recovery Mode.
Erase Data from Mac Hard Drive.
a. In the macOS Utilities window, choose Disk Utility and click Continue.
b. Choose your startup disk and click Erase.
c. Choose Mac OS Extended (Journaled) as the format.
d. Click Erase.
e. Wait until the process is finished.
Reinstall macOS (optional)

Can I delete install macOS Sierra?

2 Answers. It is safe to delete, you will just be unable to install macOS Sierra until you re-download the installer from the Mac AppStore. Nothing at all except you would have to download it again if you ever need it. After install, the file would usually be deleted anyway, unless you move it to another location.

Is Mac OS Sierra still available?

If you have hardware or software that isn’t compatible with macOS Sierra, you might be able to install the previous version, OS X El Capitan. macOS Sierra won’t install on top of a later version of macOS, but you can erase your disk first or install on another disk.

How do I reinstall Mac OS without Apple ID?

1 Answer

With Mac off Hold CMD + R and tap power button to turn on computer.
Still holding CMD + R wait for recovery screen to appear that gives reinstall option.
Before clicking reinstall click ‘disk utility’
On disk utility click the ‘Macintosh HD’ then the erase tab on the right.

How do I reinstall OSX without losing data?

How to Update & Reinstall macOS Without Losing Data

Start up your Mac from macOS Recovery.
Select “Reinstall macOS” from the Utilities Window and click “Continue”.
Follow the onscreen instructions to select the hard drive you want to install the OS on and start the installation.
Don’t put your Mac to sleep mode or close its lid during the installation.

How do I install Mac OS on a new SSD?

With the SSD plugged in to your system you’ll need to run Disk Utility to partition the drive with GUID and format it with Mac OS Extended (Journaled) partition. The next step is to download from the Apps Store the OS installer. Run the installer selecting the SSD drive it will install a fresh OS onto your SSD.

Should I install macOS High Sierra?

Apple’s macOS High Sierra update is free to all users and there is no expiration on the free upgrade, so you don’t need to be in a rush to install it. Most apps and services will work on macOS Sierra for at least another year. While some are already updated for macOS High Sierra, others are still not quite ready.

How do I reformat my Mac High Sierra?

Click the Erase button or tab, then complete these fields:

Name: Enter a name for the disk or volume, such as “Macintosh HD”.
Format: Choose either APFS or Mac OS Extended (Journaled) to format as a Mac volume. Disk Utility shows a compatible format by default.
Scheme (if shown): Choose GUID Partition Map.

How do I reinstall my High Sierra from Mojave?

Now, follow the steps to downgrade Mojave to High Sierra.

Boot your macOS into Recovery Mode and erase your macOS Mojave as mentioned in Method 1.
Choose, ‘Restore from Time Machine Backup’ from the ‘macOS Utilities’
Select Time Machine Backup external drive or Time Capsule and choose Connect to Remote Disk.

How do I reinstall Mojave on Mac without disc?

How to Reinstall MacOS Mojave

Backup the Mac before going any further, do not skip making a full backup.
Restart the Mac, then immediately hold down the COMMAND + R keys together immediately to boot into macOS Recovery Mode (alternatively, you can also hold down OPTION during boot and select Recovery from the boot menu)

How do I factory reset my Mac Mojave?

How to Factory Reset Mac OS X to Original Default Factory Settings

Reboot the Mac and right after the boot chime sound, hold down the COMMAND + R keys together to boot into Recovery Mode.
Once in Recovery Mode and at the “macOS Utilities” (or “OS X Utilities”) screen, select “Disk Utility”

Could not find installation information for this machine?

If you are installing mac os on a fresh Hard Drive then rather pressing cmd + R on startup, you need to press and hold only alt/opt key on system startup. In Recovery Mode you have to format your Disk using Disk Utility and Choose OS X Extended (Journaled) as drive format before you click Reinstall OS X.

Does installing a new OS delete everything Mac?

“Generally you don’t need to erase your startup disk to reinstall macOS,” explains Apple. 5) In the Format pop-up menu, choose Mac OS Extended (Journaled), type a new name for your disk and click Erase. This will erase all the information from the disk, including your personal data.

Does reinstalling Mac OS wipe hard drive?

Answer: A: Reinstall will not wipe your data or installed applications, it will only install the OS files. However as a standard precaution, you should backup your data before you reinstall, for the ‘just in case’ senario.

Will reinstalling Sierra delete everything?

Don’t worry, it won’t affect your files, data, apps, user settings, etc. Only a fresh copy of macOS High Sierra will be installed on your Mac again. A clean install will delete everything associated with your profile, all your files and documents, while the reinstall will not.

How do I backup my Mac in recovery mode?

Make sure this drive has enough spare disk space to store your backup files. 2-Boot your Mac into Recovery Mode. Follow the steps to do this: Shut down your Mac.

Select your external drive.
Choose “compressed”
Select Save.
Your backup process will start. It may take some time.

How do I safe boot my Mac?

Start the system in Safe Boot mode

Restart the Macintosh. Press and hold the Shift key immediately after you hear the startup tone.
Release the Shift key when the Apple logo appears. Safe Boot appears on the Mac OS X startup screen.

How do I wipe and reinstall my Mac?

Why can’t I erase my Mac?

Restart a Mac and hold down Command-R after the startup chime sounds, and the computer boots into the recovery mode. Select Disk Utility from the startup menu, and you can erase your startup drive securely. After you boot, launch Disk Utility, select the startup volume, and click the Erase tab.

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