Mac doesn't restart after download of macOS monteray
My Mac dose not restart after downloading macOS Monterey
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Power down the computer via Power Button.
Disconnect all external drives/
Pug into charger.
Suggest restarting in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.
This may or may not allow the upgrade process to complete
Did the computer have the Empty Space Requirements >> If upgrading from macOS Sierra or later, your Mac needs 26GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44GB of available storage.