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Holding down the option key (⌥) at startup brings up the boot manager, which allows the user to choose which operating system to start the device in. When using a non-Apple keyboard, the alt key usually performs the same action. The boot manager can also be launched by holding down the "menu" button on the Apple Remote at startup.
launchd has two main tasks. The first is to boot the system, and the second is to load and maintain services. Here is a simplified view of the Mac OS X Tiger system startup on a PowerPC Mac (on an Intel Mac, EFI replaces Open Firmware and boot.efi replaces BootX): Open Firmware activates, initializes the hardware, and then loads BootX.
For iPhones, iPads and Apple silicon-based Macs, the boot process starts by running the device's boot ROM. On iPhones and iPads with A9 or earlier A-series processors, the boot ROM loads the Low-Level Bootloader ( LLB ), which is the stage 1 bootloader and loads iBoot; on Macs and devices with A10 or later processors, the boot ROM loads iBoot.
A client MacBook Air (lacking an optical drive) could then wirelessly connect to the other Mac or PC to perform system software installs. Remote Install Mac OS X was released as part of Mac OS X 10.5.2 on February 12, 2008. Support for the Mac mini was added in March 2009, allowing the DVD drive to be replaced with a second hard drive.
rEFInd is a boot manager for UEFI and EFI-based machines. [1] [2] It can be used to boot multiple operating systems that are installed on a single non-volatile device.It also provides a way to launch UEFI applications.
The Happy Mac indicates that booting has successfully begun, while a Sad Mac (along with a "Chimes of Death" melody or one or more beeps) indicates a hardware or software problem. When a Macintosh boots into the classic Mac OS ( Mac OS 9 or lower), the system will play its startup chime, and the screen will turn gray.
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Kon-Boot (aka konboot, kon boot) is a software utility that allows users to bypass Microsoft Windows passwords and Apple macOS passwords (Linux support has been deprecated) without lasting or persistent changes to system on which it is executed.