You can start a Mac from a bootable USB installer by connecting the installer, opening the Mac’s startup options, and selecting the USB drive. The exact process depends on whether your Mac has Apple silicon—such as an M1, M2, M3, or later chip—or an Intel processor. A bootable installer can help you install macOS, repair … Read more
If your Mac displays a folder with a question mark, a circle with a line through it, or a message saying that no startup disk is available, it cannot find a usable macOS system. The cause may be a temporary startup selection problem, an unmounted APFS volume, a damaged file system, an erased drive, a … Read more
You can create a bootable macOS installer drive with a USB flash drive and Apple’s built-in createinstallmedia command. Download the macOS installer from Apple, erase and format a compatible USB drive in Disk Utility, then run the command for that installer in Terminal. A bootable installer can help you install macOS on a compatible Mac, … Read more
You can usually reinstall macOS without erasing your personal files. The safest method is to start macOS Recovery, choose Reinstall macOS, and install the system on your existing startup disk without using Disk Utility to erase it. A reinstall replaces macOS system files while normally preserving your user accounts, documents, photos, apps, and other data. … Read more
Connect the USB flash drive directly to your Mac. Open Terminal, which is located in the Utilities subfolder of the Applications folder. Type or paste one of the following commands The installer must be located in the Applications folder. MyVolume is the name of the USB flash drive. If the name is different, rename it … Read more