Mac Keyboard Shortcuts (useful during machine startup)

Keystroke Description
Press X during startup Force Mac OS X startup (if there are other operating systems on the disk)
Press Option-Command-Shift-Delete
during startup
Bypass primary startup volume and seek a different startup volume (such as a CD or external disk)
Press C during startup Start up from a CD that has a system folder
Press N during startup Attempt to start up from a compatible network server (NetBoot)
Press T during startup Start up in FireWire Target Disk mode
Press Shift during startup start up in Safe Boot mode and temporarily disable login items and non-essential kernel extension files (Mac OS X 10.2 and later) (note this takes a LONG time!)
Press Command-V during startup Start up in Verbose mode. Very useful if your machine isn’t booting, at least to techy-types. It lets you see everything the Mac usually hides from you during startup.
Press Command-S during startup Start up in Single-User mode. Be very careful here!

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