If your Mac starts up with an exclamation mark in a circle
The firmware of your Mac needs to be revived.
![Exclamation mark in circle screen](https://cdsassets.apple.com/live/7WUAS350/images/macos/macos-startup-exclamation-mark-in-circle.png)
In very rare circumstances, such as when a power failure interrupts macOS installation, your Mac might start up to a circled exclamation mark. This means that the firmware stored in your computer’s memory needs to be revived or restored.
Find out how to revive or restore Mac firmware
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