If you (or anyone else reading this) are after a complete nuke of your HD try this:
If you can't get online ask a friend to go to this site and follow instructions to create a "boot & nuke" disk. Then load the disk into your machine and start up.
TAKE GREAT CARE.
BE WARNED... EVERTHING WILL BE COMPLETELY ERASED ON START UP.
I AM TAKING NO RESPONSIBILITY FOR ANYTHING THAT GOES WRONG IF THIS PROGRAM IS USED INCORRECTLY. NEITHER IS ANYONE ELSE AT THIS SITE.
Recommend you don't leave the nuke disk laying around for anyone else to pick it up inadvertantly and load by mistake. Maybe destroy the disk after use. I've hidden my copy very deeply.