10 Must-Know Startup Commands for Older Macs
A variety of keyboard shortcuts and commands can be used during a Mac system startup to access various features, systems administration utilities, and troubleshooting tricks. Some of these startup keys may be slightly different on PPC and Intel Macs, but many of the features remain the same, whether it’s accessing safe-boot mode, hardware tests, single-user mode, boot from a DVD, or more. Check the list below for ten absolute essential startup commands that every Mac user should know.
|Eject CD on boot||Hold Mouse button down immediately after powering on|
|OS X Safe boot||Press Shift during startup|
|Start up in FireWire Target Disk mode||Press T during startup|
|Startup from a CD||Press C during startup|
|Bypass primary startup volume and seek a different startup volume (CD, etc.)||Press Cmd-Opt-Shift-Delete during startup|
|Choose Startup disk before booting||Press Option during startup|
|Start up in Verbose mode||Press Cmd-V during startup|
|Start up in Single-User mode (command line)||Press Cmd-S during startup|
|Force screen reset||Press R during startup|
|Force OS X startup||Press X during startup|
These come directly from Apple.