How to wipe a thoroughly secured old computer I have an old computer of mine (the first MacBook Pro model) that I'm trying to wipe clean and repurpose.  But back in the day, I was quite security conscious, and my own barriers are foiling me:


The account I used daily was not the administrator
The admin account used a different password
I set a firmware password on it


I can log into my old account that I used every day, but I can't remember the admin password or the firmware password.  This means I can't boot to target disk mode or to an OS X install DVD.

My goal is to reinstall the OS.  I've already saved all the data I need.  I know I can remove the hard drive, put it in an enclosure and wipe it with another computer, but I'd rather not go that route until I have to, since it's a big pain with that model of MBP (I did it once before).  Any ideas?
You can remove the firmware password by changing the RAM configuration, booting up to the startup menu, shutting down and changing it back. Basically, if you have two 1GB chips of RAM in there now, you can remove one of the chips, start up holding alt/option, shut down and put the other chip back in. This will remove the firmware password. 

Now, you can follow these instructions for doing the erase and install.

Good luck!