If thou dost seek to place thy Mac into recovery mode, boot from a USB stick, or commence testing thy hardware using Apple’s diagnostic tools, thou shalt employ the proper combination of startup keys. These sacred keyboard shortcuts doth grant thee the power to interrupt thy Mac’s normal boot process and even alter the very fabric of macOS upon thy log in. Behold, a guide, a map to the realm of Mac boot options and startup keys, where thou shalt find guidance on when to call upon their divine powers.
A Note Regarding Macs With Apple Silicon
The Mac startup keys heretofore listed do pertain mostly to Intel-based Macs. Lo, the startup options for M1 and M2-based Macs hath altered. Instead of starting thy computer and holding down certain key combinations, thou must access the options in a different manner:
-
Turn off thy Mac.
- Invoke thy Mac’s power and persist in holding the power button until the startup options screen doth grace thy sight.
This summoning shall usher in the macOS recovery mode, whence thou can access sundry boot modes like unto:
- Safe Mode: Select a volume, grasp the Shift key, and click Continue in Safe Mode.
- Startup Manager: All bootable disks shall be displayed in the startup options screen, so simply choose the one that doth call to thee.
- Set a Default Startup Disk: Select thy disk as above, then clasp the Option key and click Always Use.
- Target Disk Mode: Journey to the Recovery menu and select Share Disk.
Certain advanced options, such as Verbose mode, are now shrouded in secrecy. Others, like resetting SMC and NVRAM, are no longer requisite for Macs blessed with Apple silicon.
macOS Boot Modes and Key Combinations
To invoke these Mac startup commands and initiate a specific boot mode, thou must first press the power button and promptly press and hold the desired key combination.
On older Macs, thou may tarry until the boot sound doth meet thine ears ere thou grasp the shortcut. Howbeit, in later Intel-based Macs that doth lack a song of boot, thou must clutch the keys with haste.
Startup Manager/Boot From USB: Option
Apple’s startup manager doth hinder thy Mac from booting the default startup volume. Instead, a list of all connected volumes shall be presented, including USB and external drives. This artifice is most beneficial should thee need to boot thy Mac from USB or art installing Windows from a USB stick.
On some non-US Mac keyboards (and Windows keyboards), the Option key be not labeled as such. In such a case, the Alt key shalt answer thy call.
Safe Mode: Shift
Should thy Mac require troubleshooting for startup quandaries, Safe Mode (known also as safe boot) is a wise course of action. It compels thy computer to load only the bare essentials necessary to commence the operating system. Thy startup disk shall search for errors, effect repairs, and utilize solely the essential kernel extensions.
This mode doth prevent the startup and login items from unfurling at thy Mac’s inception. It doth shun custom user-installed fonts and purge a plethora of macOS system caches.
Apple Hardware Test/Apple Diagnostics: D
Depending upon thy Mac’s vintage, it shall arrive with Apple Hardware Test or Apple Diagnostics. These are tools of investigation that will unveil Mac hardware tribulations so thou may essay to resolve them or deem it time to supplant thy machine.
Whilst these tests doth seek hardware malaises, they doth provide scant details about the vexation. This can render attempts at remedy a challenge. If thou art bold of heart and desire more enlightenment, thou must partake of Apple Service Diagnostics instead.
Thou may also invoke Option + D to commence the test from the internet. This is ideal should thy hard drive or recovery partition be mired in difficulty.
Reset PRAM/NVRAM: Cmd + Option + P + R
Parameter RAM, yclept nonvolatile RAM, doth hold information of thy computer’s present configuration. This encompasses the date and time, volume, desktop settings, and more. On occasion, thou shalt encounter issues related to sound, mouse scrolling, or keyboard that doth necessitate a PRAM/NVRAM reset.
This is one of the most useful Mac troubleshooting commands. Shut down thy Mac, resurrect it, then forthwith strike the key combination aforesaid. Await until thy Mac doth reboot anew, then relinquish the combination.
Reset SMC: Shift + Control + Option
The System Management Controller (SMC) be a chip on Intel-based Macs that governs aspects like unto fan speeds, power management, and more. Most Apple computers doth employ the combination of keys bequeathed above, but antediluvian models doth require thee to extricate batteries or unloose the power cord instead.
Recovery Mode: Cmd + R
Recovery mode be thy gateway to resolving myriad macOS dilemmas from a genial environment. The recovery partition be a distinct realm upon thy Mac’s drive that thou may utilize to mend disks using Disk Utility, access the Terminal, and reinstate thy Mac by reinstalling macOS.
Thou may also cling to Cmd + Option + R to commence internet Recovery mode, which doth download the essential tools from the internet ere all else. This is optimal should thee yearn to restore thy recovery partition.
Target Disk Mode: T
Should thou wish to convey files from one Mac’s hard drive unto another, Target Disk mode doth simplify the endeavor. By awakening a Mac in Target Disk mode, thou may connect it to another Mac and effortlessly transfer files to and fro the drives.
In essence, this hath the power to transform thy Mac into a hard drive enclosure. Yet beware, for thou must wield the appropriate cable for the task. Apple’s edicts doth stipulate that thou may use:
- Thunderbolt 3 (USB-C): iMac Pro/iMac 2017, MacBook Pro 2016, and later
- USB-C: MacBook 2015 and later
- Thunderbolt 2
- FireWire
Thou canst not wend with USB-A to USB-A cables, an Apple USB-C charging cable, or commonplace Mini DisplayPort cables.
Single User Mode: Cmd + S
Single User mode bestirs thy Mac into a minimal text-based milieu sans GUI and sans mounted drive volumes at startup. Thine only access shall be unto a Unix prompt, into which thou must inscribe commands.
This mode doth enable thee to resolve predicaments with a Mac that doth refuse to commence. Thou may strive to mend the disk, copy files from one volume to another, or compel optical media to eject—but thou must ken the correct commands to do so.
Verbose Mode: Cmd + V
Verbose mode, as its name doth imply, shall supplant thy Mac’s default startup graphics with an elaborate status report detailing precisely what doth occur as thy computer initiates. It doth not hinder aught from loading as Safe mode doth, nor doth it boot into a command line milieu like Single User mode.
Verily, Verbose mode is perfect for those occasions when thy Mac doth linger in boot. Thou shalt behold precisely what doth disrupt the boot process and perchance take measures to rectify the situation.
For instance, many boot quandaries art linked to third-party kernel extensions. Verbose mode may illuminate the offending extension, granting thee the ability to reboot in Safe mode, excise the troublesome item, then boot as usual and assay afresh.
Boot From Optical (CD/DVD) Media: C
Doth thy Mac possess an optical drive of yore? If so, thou may fashion CD or DVD images for installing macOS or other operating systems like Linux and Windows. Clutching C whilst thy computer boots doth compel macOS to disregard thy startup volume in favor of bootable optical media instead.
Eject Optical Media: Eject, F12, or Mouse/Trackpad
Hath a CD or DVD become snared within thy Mac? Dost thou attempt to boot from the erroneous optical volume? Kindle thy Mac and immediately press and hold Eject, F12, or thy mouse/trackpad button until thy computer doth expel the disc.
Boot From NetBoot Service: N
NetBoot doth allow system stewards to boot client computers from a network image, a task not oft required by most domicile users. This permits companies to customize macOS to their liking and forge bespoke images for specific users, then disseminate them network-wide without amending every machine.
Thou may also engage Option + N to designate the default image, in lieu of a custom image tailored for specific users or hardware.
macOS Login Key Combinations
The ensuing combinations do alter the manner in which login transpires upon thy Mac.
Disable Automatic Login: Left Shift
Should thy Mac be set to login automatically, thou may bid it to disregard this configuration by clinging to Left Shift after the boot screen, a white Apple logo and progress bar, doth appear. Thou shalt be transported to the customary login screen, where thou may select another user account or continue with the guest account.
Prevent Login Items/Previous Windows: Shift
Desire to halt all thy login items and previous session windows from unfurling upon launch? When thou dost reach the login screen, enter thy password as is wont, then click on the Log In button (or strike Enter). At that moment, clasp the Shift key while thy Mac doth login and commence.
This course is ideal should thee have left certain delicate folders open that thou dost wish to conceal from prying eyes, or to thwart any resource-hungry applications from commencing forthwith.
Understand the macOS Boot Options
These iMac or MacBook startup commands can aid thee in troubleshooting a multitude of commonplace problems, whether they be of hardware or software nature. Keep them in mind shouldst thou next encounter an obstacle, for they can guide thee in restoring thy system to its former glory without the intervention of a repairman.
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