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
- Use Apple Intelligence in Photos
- Summarise notifications and reduce interruptions
- Apple Intelligence and privacy
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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
If your Mac doesn’t recognise an external display
If your Mac doesn’t recognise that a separate display is connected, you can try to detect it in System Settings or try one of the other troubleshooting tips below.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)Press and hold the Option key to make the Detect Displays button appear in place of the Night Shift button, then click Detect Displays.
If your Mac still doesn’t recognise the attached display, try any of the following:
Unplug the display from your Mac, then plug it back in.
Make sure the cable you’re using is securely connected to the correct port.
Make sure you’re using the correct cable to connect your display.
Tip: To get more detailed information about the type of video display your Mac supports, check the tech specs for your Mac: Choose Apple menu
Make sure you’re using the correct adapter, if needed. See the Apple Support article Adapters for the Thunderbolt or USB-C port on your Mac.
If you’re using a third-party display, check the included documentation to ensure you’re connecting the display according to the manufacturer’s guidelines.
