mini Mac restore
how do I tell Mac mini to boot from usb- what keys do I hold as it restarts- I have a bootable usb in it
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What year model is the Mac mini and what macOS is it running?
see > Identify your Mac mini model - Apple Support
Try holding the Alt (option) key at startup or restart for Disk Manager.
see > Change your Mac startup disk - Apple Support
Or go to > Apple > System Preferences > Startup Disk > highlight the Bootable USB > click Restart.
Tip: if you do not see the Bootable USB, then if is not bootable by your Mac mini.