Secure your Mac – How to set an Open Firmware / EFI Firmware Password on system boot
Aug 15, 2009 - Leave a Comment
If you really want to lock down your Mac from other users, you can set an Open Firmware (PPC) or EFI (Intel) password that will require a firmware level password immediately upon system boot, prior to Mac OS X being loaded. This is somewhat of an advanced trick and if you accidentally mess something up in OpenFirmware or EFI you could have some serious issues with your Mac. If you’re interested in pursuing the boot level password protection though, here’s a very clear walkthrough on Apple’s knowledge base site:
