Mac User Guide
- Welcome
- What’s new in macOS Sequoia
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- Get started with Apple Intelligence
- Use Writing Tools
- Use Apple Intelligence in Mail
- Use Apple Intelligence in Messages
- Use Apple Intelligence with Siri
- Get web page summaries
- Summarise an audio recording
- Create original images with Image Playground
- Use Apple Intelligence in Photos
- Summarise notifications and reduce interruptions
- Use ChatGPT with Apple Intelligence
- Apple Intelligence and privacy
- Block access to Apple Intelligence features
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- Intro to Continuity
- Use AirDrop to send items to nearby devices
- Hand off tasks between devices
- Control your iPhone from your Mac
- Copy and paste between devices
- Stream video and audio with AirPlay
- Make and receive calls and text messages on your Mac
- Use your iPhone internet connection with your Mac
- Share your Wi-Fi password with another device
- Use iPhone as a webcam
- Insert sketches, photos and scans from iPhone or iPad
- Unlock your Mac with Apple Watch
- Use your iPad as a second display
- Use one keyboard and mouse to control Mac and iPad
- Sync music, books and more between devices
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- Control what you share
- Set up your Mac to be secure
- Allow apps to see the location of your Mac
- Use Private Browsing
- Keep your data safe
- Understand passwords
- Change weak or compromised passwords
- Keep your Apple Account secure
- Use Mail Privacy Protection
- Use Sign in with Apple for apps and websites
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
- Copyright
Erase and reinstall macOS
Important: Do not follow the steps below if your computer is a Mac with Apple silicon or an Intel-based Mac with the Apple T2 Security Chip. Instead, follow the steps in Erase your Mac.
Before you begin
Erasing your Mac removes all the information from it. Back up your Mac with Time Machine.
Make sure your Mac is connected to the internet.
If you’re reinstalling on a Mac laptop, plug in the power adapter.
Erase and reinstall macOS on an Intel-based Mac without the Apple T2 Security Chip
You can use macOS Recovery, the built-in recovery system on your Mac, to erase and reinstall macOS.
Choose Apple menu
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.
Type a name for the volume in the Name field, click the Format pop-up menu and choose APFS, then click Erase Volume Group.
When the erase process is complete, click Done, then choose Disk Utility > Quit Disk Utility.
In the Recovery app window, click Reinstall macOS [name], then click Continue.
Follow the on-screen instructions.
