Useful Apple Start-up Key Combinations
- Hold Option or Alt to get to the start up disc options, from here press N to boot to the Network (Deployment Studio
- Press C during startup to boot from a bootable CD\DVD or USB
- Press D during startupStart up in Apple Hardware Test (AHT)
- Press Option-Command-P-R until you hear startup sound a second time.Reset NVRAM
- Press Option during startupStart 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 buttonEjects any removable media, such as an optical disc.
- Press N during startupAttempt to start up from a compatible network server (NetBoot).
- Press T during startupStart up in Target Disk Mode.
- Press Shift during startupStart up in Safe Boot mode and temporarily disable login items.
- Press Command-V during startupStart up in Verbose mode.Press Command-S during startupStart up in Single-User mode.
- Press Option-N during startupStart from a NetBoot server using the default boot image.
- Press Command-R during startupStart from the OS X Recovery System1