Ensure the bootable installer (USB flash drive) is connected to your Mac. Shut down your Mac. Hold down Option/Alt and press the power button. The boot device list window should appear with a yellow disk with Install (software name) below it.
How do I manually reinstall Mac OS?
Install MacOS Choose Reinstall MacOS (or Reinstall OS X) from the utility window. Click Continue and follow the on-screen instructions. You will be prompted to select your drive. If you don’t see it, click View all industries. Click Install. Your Mac will reboot after the installation is complete.
How can I erase and reinstall Mac OS?
Boot your computer into macOS Recovery: In the Recovery app window, select Disk Utility, then click Continue. In Disk Utility, select the volume you want to erase in the sidebar, then click Erase in the toolbar. Erase macOS and install it again.
How do I force my Mac to boot from USB?
Hold down the “Option” key when you hear the startup sounds – this will take you to the Startup Manager. Once the Startup Manager appears, you can release the Option key. Startup Manager will then begin scanning your device for any drives it can boot from, including your USB.
How do I reinstall OSX High Sierra from USB?
Create a bootable macOS installer Download macOS High Sierra from the App Store. When it’s done, the installer will launch. Plug in the USB stick and start Disk Utilities. Give the USB stick a name and then click Erase. Click the Erase tab and make sure Mac OS Extended (Journaled) is selected on the Format tab.
Can you install macOS from USB?
Use an external drive or USB to install a fresh copy of macOS. You can install or reinstall the Mac operating system on a supported device using an external drive. Apple only recommends system administrators follow these steps, as a bootable installer is unnecessary to update or reinstall macOS.
Will I lose data if I reinstall macOS?
Two answers. Reinstalling macOS from the recovery menu will not erase your data. However, if there is any corruption issue, your data may also be corrupted; that’s hard to say. Reinstalling the operating system alone does not erase any data.
How do I reinstall OSX without recovery mode?
Boot your Mac from a shutdown or reboot it, then immediately hold Command-R. The Mac should recognize that no macOS recovery partition is installed, showing a spinning globe. It would help if you were then prompted to connect to a Wi-Fi network and enter a password.
How do I reinstall macOS Online?
Using Internet Recovery to reinstall macOS, Shut down your Mac. Hold down Command-Option/Alt-R and press the Power button. Hold those keys until you see a spinning globe and the message “Starting Internet Recovery. The message is replaced by a progress bar. Wait for the MacOS Utilities screen to appear.
How do I reinstall OSX without the internet?
You install a fresh copy of macOS through Recovery Mode Restart your Mac while holding 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.” ‘ Enter your Apple ID if prompted.
How do you reset a Mac OS?
To reset your Mac, first restart your computer. Then hold Command + R until you see the Apple logo. Then go to Disk Utility > View > View All Devices and choose the top drive. Then click Clear, fill in the required information, and press Clear again.
What if I can’t reinstall OSX?
Can’t reinstall OS X on your Mac? Try resetting the PRAM First, shut down your Mac completely via the Apple Toolbar. Then hold down the Command, Option, P, and R buttons on your keyboard as you restart your Mac. After the second bell, release the buttons and let your Mac reboot normally.
Which Macs can boot from USB?
1 Answer. Any Intel Mac that can run Mac OS X Tiger 10.4. Five can boot from USB (as long as the version of Mac OS X on that USB is at least Mac OS X Tiger 10.4.
How do I know if my Mac is USB bootable?
Open Startup Disk in System Preferences. If it appears in the list, it should be able to start. Open Startup Disk in System Preferences. If it appears in the list, it should be able to start.
How do I enable BIOS to boot from USB?
Plug your USB into your device, reboot your computer, and enter the BIOS settings. In the BIOS settings, go to the ‘Boot’ tab. Select ‘Boot Option #1’. Press ENTER. Select your USB device. Press F10 to save and exit.
How do I reinstall OSX High Sierra?
To reinstall macOS or high Sierra: Back up your Mac before you begin. On the “macOS Utilities” screen, choose “Reinstall macOS”. Restart the Mac and hold down the COMMAND + R keys simultaneously after you hear the startup chime; this will boot the Mac into recovery mode.
How do I download OSX without an App Store?
How to Download a Full MacOS Catalina Installer Without the App Store Visit the dosdude1 website and click “Download Latest Version” to start downloading the macOS Catalina Patcher on your system. This will open a new window. Click “Continue” to begin the macOS Catalina installation process.
How do I install macOS High Sierra without USB?
Restart your Mac or turn it on while holding down the Command + R key combination. Release the Command + R key combination when you see the Apple logo on display. Once you see a window like the one below, click Disk Utility and Erase your main Mac HDD (or SSD).
How do I download OSX Catalina to USB?
Creating a Bootable macOS Catalina 10.15 USB Installation Disc Step 1: Download macOS Catalina. Step 2: The installer will launch automatically after successfully downloading macOS Catalina. Step 3: Open Finder → Applications, right-click on Install MacOS Catalina Beta and choose Show Package Contents.
Can I load Mac OS on a PC?
Apple doesn’t want you to install macOS on a PC, but that doesn’t mean it can’t. Numerous tools will help you create an installer to install any macOS version of Snow Leopard on a non-Apple PC. Doing this will give you what is affectionately called a Hackintosh.