Can't get past login screen and accidentally added a Firmware password?

Hi, please can you help me.
Up until about a week ago my Mac Mini Server (running snow leopard server) was working fine, but when I re-started my user name and password stopped working (the panel shakes).
I booted the computer from the Install DVD and changed the password. When I restarted this still didn't work. I booted again from the DVD and changed the password again, it came up with a warning about the password also needed to be changed elsewhere.
I had a look round the utilities on the DVD and saw the Change Firmware Password (I know now this was a massive mistake!), so I changed that and clicked add!
Now I cant boot from the DVD as all the Keyboard start-up commands don't work.
I have tried starting up, holding down Command-Option-O-F. This didn't work.
Checked to make sure the Keyboard is working.
I also tried removing all RAM and holding down Command-Option-P-R and waited for this to chime 3 times.
I cant find any thing else to try on the internet.
I think to solve my initial problem, I need to Boot from the DVD and change the ROOT password, somehow login as the ROOT account then change the passwords. Is this right?
Any help would be greatly appreciated,
Thanks,
Regards Andy

If you can remember the firmware password you set:
Boot the computer with the install DVD in the drive (I'm assuming you have the external optical drive, based on your previous post) and hold down the OPTION key. You will see a screen with an input field. Enter your firmware password here, then press enter. The boot manager will load, showing you the internal HD as well as the DVD. Boot from the DVD, and go back into the firmware password utility. Enter the password in the old password field, and leave the new password fields blank. This will remove the firmware password.
If you *can not* remember the firmware password you set:
Open up the computer and remove only 1 of the 2 installed RAM sticks. Boot the computer holding COMMAND + OPTION + P +R and wait for 3 startup chimes. This will remove the firmware password.
Once you have removed the password and are booted to the DVD:
See this article: http://support.apple.com/kb/ht1274
You want the section labeled "Resetting the original administrator account password."
Message was edited by: John.Kitzmiller to fix spelling mistakes.

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