OS X: Startup key combinations

There are moments when even Mac OS X has problems and needs to be started in special configurations.


For such cases, Apple compiled a table of various key combinations to be used at startup, that, for convenience, I also copy here.

Keystroke Description
Press C during startup Start up from a bootable CD or DVD, such as the Mac OS X Install disc that came with the computer.
Press D during startup Start up in Apple Hardware Test (AHT).
Press Option-Command-P-R until you hear two beeps. Reset NVRAM
Press Option during startup Starts into Startup Manager, where you can select a Mac OS X volume to start from. Note: Press N to make the the first bootable Network volume appear as well.
Press Eject, F12, or hold the mouse or trackpad button Ejects any removable media, such as an optical disc.
Press N during startup Attempt to start up from a compatible network server (NetBoot).
Press T during startup Start up in Target Disk Mode.
Press Shift during startup Start up in Safe Boot mode and temporarily disable login items.
Press Command-V during startup Start up in Verbose mode.
Press Command-S during startup Start up in Single-User mode.
Press Option-N during startup Start from a NetBoot server using the default boot image.

About Liviu Ionescu (ilg)
Hi! My name is Liviu Ionescu (ilg, ilegeul or eunete for colleagues and friends) and I’m a senior IT engineer. Or should I say a real programmer?

One Response to OS X: Startup key combinations

  1. Pingback: PC restrict/limit access software on administrative account?

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