Since your M1 chip is fully compatible with Apple Intelligence, you absolutely do not need a new iMac. Try these troubleshooting steps to restore functionality:
- Open System Settings and go to General > Language & Region.
- Ensure your primary language is set to English (United States) or English (UK).
- Go to Apple Intelligence & Siri.
- Verify that Siri's language matches your system language exactly (e.g., if system is English US, Siri must be English US).
- Change the Siri voice to a different option temporarily, then change it back to force the Mac to refresh its asset parameters.
2. Purge and Reload the On-Device Intelligence Assets
If the system switched over to the new Siri backend, the local AI assets required for basic proofreading in Pages may have become corrupted or failed to complete their background download.
Go to System Settings > Apple Intelligence & Siri.
Toggle the main Apple Intelligence switch to Off.
Restart your iMac.
Go back to the settings panel and toggle it On again.
Leave your Mac connected to Wi-Fi and power for a short while to ensure the underlying on-device models fully re-download without interruptions