On your Mac, choose Apple menu Shut Down. After your Mac shuts down, wait 10 seconds. Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options. Select a startup disk. Press and hold the Shift key, click Continue in Safe Mode, then release the Shift key. Bold new experience. Unparalleled power. Legendary ease of.

1. D U E L Mac Os X
2. D U E L Mac Os Download

• Access all of your Google Drive content directly from your Mac or PC, without using up disk space. Learn more Download Backup and Sync for Mac Download Backup and Sync for Windows.
• A media access control address (MAC address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth.

macOS Design Themes

Four primary themes differentiate macOS apps from iOS, tvOS, and watchOS apps. Keep these themes in mind as you imagine your app’s identity.

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Flexible

People expect macOS apps to be intuitive, while simultaneously adaptable to their workflow through customization and flexibility. Many apps offer configurable preferences, customizable interfaces, and alternate ways of completing tasks. Windows can often be resized and interface elements hidden or repositioned. Tasks can be initiated from toolbars, menus, controls, keyboard shortcuts, the Touch Bar, accessibility features, and more. A flexible app facilitates learning through discoverability.

Expansive

Large, high-resolution displays are typical for most Mac users, and people often extend their workspace by connecting additional displays. Apps can leverage this expansiveness and provide value by utilizing a wide range of interface components—like tabs, sidebars, sheets, and panels—and supporting immersive features like full-screen mode.

Capable

Macs are extremely capable in terms of hardware and software. Apps can harness this power to offer an extensive range of features and workflows that meet a wide variety of simple, advanced, and niche user needs.

Focused

macOS is designed to keep the current task clear and in focus. Visual contrast, translucency, and a large drop shadow make it easy to differentiate the active window from inactive windows. Interfaces defer to content and related controls. Throughout the system, adornments are subtle and appropriate.

Start up from macOS Recovery

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

Intel processor

Make sure that your Mac has a connection to the internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

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If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

• If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
• If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
• If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
• Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

After installation is complete, your Mac might restart to a setup assistant. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

• On an Intel-based Mac: If you use Shift-Option-Command-R during startup, you're offered the macOS that came with your Mac, or the closest version still available. If you use Option-Command-R during startup, in most cases you're offered the latest macOS that is compatible with your Mac. Otherwise you're offered the macOS that came with your Mac, or the closest version still available.
• If the Mac logic board was just replaced, you may be offered only the latest macOS that is compatible with your Mac. If you just erased your entire startup disk, you may be offered only the macOS that came with your Mac, or the closest version still available.

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

• Use the App Store to download and install the latest macOS.
• Use the App Store or a web browser to download and install an earlier macOS.
• Use a USB flash drive or other secondary volume to create a bootable installer.