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Fix a Mac that has Sidecar that will not work

We'll rule out compatibility, Apple ID, and connection, then fix Sidecar settings—or tell you when to call a pro.

Troubleshooting · Home maintenance
10–20 min
What you'll need
  • Compatible Mac and iPad
  • Same Apple ID on both
  • USB cable (optional, for wired connection)
Step 1 of 5

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Steps

Goal: Get Sidecar working so the iPad acts as a second display.

  • Confirm Mac and iPad are compatible.
  • Confirm the same Apple ID on both.
  • Turn on Wi‑Fi and Bluetooth; try a cable if wireless fails.

Check compatibility

Goal: Confirm devices support Sidecar.

  • Mac: 2016 or later. iPad: supports Apple Pencil (Pro, Air 3+, iPad 6+, mini 5+).
  • Good: Compatible. Proceed to Connect with cable if wireless fails.
  • Bad: Device too old—Sidecar not supported.

Connect with cable

Goal: Use a cable when wireless fails.

  • Connect iPad to Mac with USB-C or Lightning cable.
  • Click AirPlay icon → select iPad.
  • Good: Sidecar works.
  • Bad: Update macOS and iPadOS; restart both.

When to get help

Call a pro if:

  • Devices are compatible, same Apple ID, and Sidecar fails with cable and wireless.

Verification

  • iPad appears in the AirPlay menu.
  • iPad shows the Mac desktop as a second display.
  • Cursor and windows move to the iPad display.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Compatibility and Apple ID Confirm compatible devices; same Apple ID.
  2. Wi‑Fi and Bluetooth Turn both on; try cable if wireless fails.
  3. Update and restart Update macOS and iPadOS; restart both.
  4. Call a pro Hardware or account issue.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Mac and iPad models
  • Apple ID on both devices
  • Connection: wireless or cable
  • Steps already tried

Are the Mac and iPad compatible with Sidecar?

Mac 2016+, iPad with Apple Pencil support.

Check Apple support docs for Sidecar requirements. Good: compatible—check Apple ID. Bad: device too old—Sidecar not supported.

Yes No

You can change your answer later.

Device not compatible

Sidecar needs Mac 2016+ and iPad with Apple Pencil support. Use a different display or third-party app.

Done

Is the same Apple ID signed in on both?

Different accounts cannot use Sidecar.

System Settings → [Your Name]. Compare with iPad. Good: same—check Wi‑Fi and cable. Bad: sign in with correct account.

Yes No

You can change your answer later.

Sign in with correct Apple ID

Sign in to iCloud with the same Apple ID on both devices. Retry Sidecar.

Done

Try cable connection

Cable can work when wireless fails.

Connect iPad to Mac with USB cable. Click AirPlay icon → select iPad. Good: Sidecar works. Bad: update macOS and iPadOS; restart both; call pro if persists.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would Sidecar not work?
Incompatible Mac or iPad, different Apple ID, Wi‑Fi or Bluetooth off, or iPad not signed in. Check compatibility and Apple ID first.
Can I fix Sidecar myself?
Yes. Confirm compatible devices, same Apple ID, Wi‑Fi and Bluetooth on. Try a USB cable if wireless fails. Update macOS and iPadOS.
When should I call a pro for Sidecar?
If devices are compatible, same Apple ID, and Sidecar still fails with cable and wireless. Hardware may need Apple support.

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