Try a Safe BootĪll macOS and Mac OS X 10.2 and later have a Safe Boot feature that includes disk checking and repair. Ideally, shut down between each addition. You might need to shut down your Mac, add one item, and start up again. Strictly follow a process of elimination. If it boots up now, one of those disconnected peripherals (or a combination of them) is the source problem.Īdd each peripheral back one at a time to determine which one(s) are the problem. If at all possible, use the Apple-branded keyboard and mouse that shipped with your Mac. If you installed any expansion cards, remove those too. So before you get drastic and try safe mode or other measures, shut down your Mac and disconnect all wired and wireless (Bluetooth) peripherals except your keyboard, mouse, and anything else necessary to reboot. Often it’s those third-party peripherals that get our Macs into trouble.
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