When pressed briefly, it starts the Mac up in normal macOS mode when pressed and held until the Mac reports that it’s loading Recovery Options, it engages Recovery mode, where you navigate startup and other options using buttons and menus. The primary control of startup on Apple silicon Macs is the Power button alone. This chart doesn’t include resetting the SMC, which isn’t a startup mode as such, and varies by model.įurther details about choosing startup modes for Intel Macs is in this article, which has links to more detailed accounts. If you’re having problems getting your Mac to boot in local or Internet Recovery or Diagnostics, be sure to give it plenty of time before concluding that the attempt has failed, as your Mac may be still trying to download the software for that mode, even if you have tried to start it up in a local and not Internet mode. Internet versions of Recovery and Diagnostics work the same, except that they don’t perform any local search for the disk image, and proceed straight to download. If that fails, the download process is repeated up to 11 times before abandoning the attempt. In that, the appropriate disk image is downloaded from Apple’s servers via HTTP (not HTTPS) and undergoes the same integrity check. If the disk image can’t be found or fails its integrity check, the Mac should automatically switch to using Internet Recovery or Diagnostics. Local versions of those modes load disk images containing the required software prior to their loading, their integrity is checked. Information from Apple reveals important details about how current firmware handles Recovery and Diagnostics modes. Here’s a tear-out PDF version: IntelMacBootModes2 It may prove best to connect any wireless keyboard using its charging cable, or to use a USB keyboard instead. Although these often work using Bluetooth, some Macs with certain firmware versions don’t read the keyboard status reliably. Early during the boot process, the firmware checks which, if any, keys are being held, which determine how it proceeds. Intel startup controlsįor Intel Macs, the mode to be used at startup is almost entirely determined by any keys held down during the startup process, and the (U)EFI firmware installed. What happens next on an Intel Mac is governed by its (U)EFI firmware, and any keys you might be holding at the time, whereas an Apple silicon Mac runs its own firmware and checks what you’ve done with the Power button alone. The moment you press the Power button, Intel and Apple silicon Macs are different.
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