Startup key combinations for Macs

Keystroke

Description

Press C during startup

Start 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 or network volume to start from.  

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.

Press Command-R during startup

Start from the OS X Recovery System

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s