Since you bought the machine used, you may want to consider just going out and purchasing an OS X installer CD. Basically, I'd just wipe the machine out, and just put a new, fresh system install on it so you don't "inherit" the previous owner's issues that they may have had.
Also, it's not really advisable to post details about subverting system passwords on a board like this. Even though you motives for doing it may be pure, the techniques for doing it can also be used to gain unauthorized access to other machines.
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