If this doesn’t work, you may need to try resetting the System Management Controller (SMC). This will force your Mac to restart and should get it working again. (On laptop computers that have Touch ID, press and hold Touch ID instead.) Then press and release the power button normally. To do this, press and hold the power button on your Mac for about 10 seconds. If your Mac won’t boot up, you’ll need to force it to restart. Doing this will help keep your Mac running optimally and efficiently. To ensure you are taking full advantage of all the benefits that come with rebooting your Mac, try to complete any tasks you are working on before the end of the day so you can shut down your Mac and reboot it before starting again. It also gves the Mac a chance to clean up any applications that may be running in the background. Rebooting helps clear out any cached data, refresh the operating system, and help with any new software updates that may have been installed. You should reboot your Mac every few days to keep it running smoothly. Once complete, you can close Disk Utility and go back to the macOS Utilities window where you can now select Reinstall macOS to reset your MacBook Air. From here, select your startup disk from the sidebar on the left and then choose Erase from the Edit dropdown menu. Once opened, select Disk Utility from the macOS Utilities window, then click Continue. This will start up the built-in macOS Recovery system. To reset your MacBook Air, you’ll need to press and hold the Command (?)-R keys together.
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