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macOS User Guide
- Welcome
-
- Continuity
- Hand off between devices
- Insert photos and scans from iPhone or iPod
- Copy and paste between devices
- Unlock your Mac with Apple Watch
- Make and receive iPhone calls in FaceTime
- Get SMS texts from iPhone in Messages
- Control accessories in Home
- Send files between devices with AirDrop
- Use AirPods with your Mac
- Stream content to Apple TV
- Resources for your Mac
- Resources for your Apple devices
If your Mac displays a question mark at startup
A flashing question mark at startup means your Mac is having trouble locating the system software.
If your Mac starts up after a brief delay, try reselecting your startup disk. Choose Apple menu > System Preferences, click Startup Disk, then select the startup disk.
If your Mac doesn’t start up, see the Apple Support article If a flashing question mark appears when you start your Mac.
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