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Startup key combinations for Intel-based Macs

Keystroke Description

Press C during startupStart up from a bootable CD, DVD, or USB thumb drive (such as OS

X install media).

Press D during startup Start up in Apple Hardware Test (AHT).

Press Option-Command-P-R

until you hear startup sound a

second time.

Reset NVRAM

Press Option during startup

Start up in Startup Manager, where you can select an 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 buttonEjects 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 Bootmode and temporarily disable login items.

Press Command-V during

startupStart up in Verbose mode.

Press Command-S duringstartup

Start up in Single-Usermode.

Press Option-N during startup Start from a NetBoot server using the default boot image.

Press Command-R during

startup

Additional Information

Rate this article:

Summary

Learn about the startup key combinations you can use

with Intel-based Macs.

Products Affected

Mac Pro, Mac mini, MacBook, MacBook Air, MacBook Pro,

iMac

You can use the following startup key combinations with Intel-based Macs.

Start from Lion Recovery

Available on Macs that ship with OS X Lion. Some CPUs require an EFI BootROM update to support this feature.

For the best experience with startup keys, press the keys immediately after the startup tone plays.

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