„I do not own a Mac (yet) but I do administrate some at work and have used this list a number of times. Macs dont have a %u201Cbios%u201D per se but they do have keyboard shortcuts that can kick off various functions during boot. I%u2019ve used the %u201CT%u201D one to boot from an ipod once (I had to install Tiger on a machine that didn%u2019t have a DVD drive).
I%u2019ve found two lists, one for Mac and one for Mac Intel machines.
* X during startup – Force Mac OS X startup
* option – (eventually) brings up a screen with startup volume choices
* Option-Command-Shift-Delete – Bypass primary startup volume and seek a different startup volume (such as a CD or external disk)
* C – Start up from a CD that has a system folder
* N – Attempt to start up from a compatible network server (NetBoot)
* T – Start up in FireWire Target Disk mode (very handy for plugging your Mac into another as an external hard drive)
* Shift – start up in Safe Boot mode and temporarily disable login items and non-essential kernel extension files (Mac OS X 10.2 and later)
* Command-V – Start up in Verbose mode.
* Command-S – Start up in Single-User mode
* cmd-opt-p-r – Zap PRAM. Hold down until second chime.
* cmd-opt-n-v – Clear NV RAM. Similar to reset-all in Open Firmware.
* cmd-opt-o-f – Boot into open firmware
* hold mouse click – force eject a CD/DVD
Mac Intel [credit]
* Press C during startup Start up from a bootable CD or DVD, such as the Mac OS X Install disc that came with the computer.
* Press D during startup Start up in Apple Hardware Test (AHT), if the Install DVD 1 is in the computer.
* Press Option-Command-P-R until you hear two beeps. Reset NVRAM
* Press Option during startup Starts into Startup Manager, where you can select a Mac 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 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 FireWire 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.“