I have a Intel Mac mini that has 10.5 OS X installed on it. This was used by a disgruntled employee that was fire and of course he wont give the passwords. As he has vital info on this Mac, I need to change the passwords. I know how to do that. I thought I knew how to boot it off the CD. I tried holding down the "C" button when starting it up and nothing. I tried to reset the firmware by holding down the option+command+P+R and nothing and option+command+F+O. The Mac ignored every single keyboard command and just went to the login screen. I know the keyboard works as I can type in a password (of course wrong ones). What do I do?