Normally, you can start up a Mac while holding down Command-R to boot into what Apple now calls macOS Recovery. The article includes instructions on obtaining the installer, which might involve you having to use someone’s else Mac to download it, if you don’t have a replacement Mac on hand yet.īut if you can’t get access to another Mac or the necessary drive, it’s still possible to use a different Recovery mode on all recent Macs, dating back to 2010. Making a bootable installer with macOS Sierra (as well as archived versions for several previous releases). I don't know of a good guide to the last bullet point, but internet fame awaits someone (perhaps you!) that figures a nice way to hack a mac to show the boot screen as you ask.Recovery lets you install onto an erased partition, but only if Recovery wasn’t erased, too!īecause Recovery didn’t work, the fastest way to install fresh is to make or borrow a macOS installer on a USB flash drive or a disk drive.
get into hardware / firmware hacking to make this the default.set an alternate bootable image like rEFIt in NVRAM.introduce only the volume you want to boot (which bypasses the screen you wanted to see - but might get you the end result).Startup key combinations for Intel-based Macs.The only deviations from this are when you press one of the startup key combinations to alter this list. if that volume is not present (or NVRAM is reset to defaults), find the first viable boot volume in the local device tree and hand things off to mach_kernel (et.launch mach_kernel (or EFI on Windows / Linux side of things) and exit.read the value of the startup disk from NVRAM.
This is the hardware behavior and unless you rewrite the code / replace the hardware, you are bound by this functionality. Intel Macs have the following basic behavior at boot time when the chime indicates a successful POST. When a mac can't find the first viable image to boot, it's programmed to get the prohibitory icon - not the boot picker. You don't without modifying things on a low level or adding custom software like the awesome Boot Runner.
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