Wiping harddrive without using the screen

My iMac 20" has got a broken lcd display, but the internals all work fine, even the backlight.
When I turn it on it just has a white screen and I manged to get everything I needed off it by connecting it by firewire to my new mac.
My question is how do I wipe the hard drive without using the screen, can you do it over fire wire or usb?
I want to sell for spares or repairs but don't want any sensitive information to be given away or have to give a password away
Thanks
Phil

Startup your old iMac in Target Disk mode by holding the "T" during boot up.
Attach to your new iMac. The hard drive on your old iMac should appear on the desktop of your new iMac.
Using Disk Utility, erase the drive on your old iMac.

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