You should be able to start the computer from a retail OS X 10.6.3 Snow Leopard installer
(unless the computers came with a later version of Snow Leopard 10.6 on DVD install disc)
and then use it to erase and install a completely new system. You can use Disk Utility to
secure erase (one or more passes) before installing. The format and partitioning setup
would totally eradicate the original owner information from the computer.
Unless there was a File Vault or secure encrypted
hard disk drive requiring password to access.
There are a few secure methods or devices built into the OS X that can put a firmware
block on the computer, so even swapping a hard drive out may not allow access. Some
may require physical access to remove one of the memory chips to reset access.
Use original install-restore DVD software kit that shipped with the computer, or a retail
DVD version of Snow Leopard more recent than any version of 10.6 that may have been
installed on the computer, since you cannot install & run an OS X older than the one it
had on it when new (under most circumstances) -- so if you have that DVD, hold the C
key down on startup for quite a period of time until the Installer loads in the desktop.
Not sure how much experience you have, and the time here/now is late. Post back if
you find another issue; someone may see the thread & reply with more information.
Good luck & happy computing! 🙂
edited 2x
