... Without having the old password?
Just bought a new used Mac and the seller does not have the password. I can't dowload updates.
Wirelessly posted (iPhone : Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Mobile/7A341)
Without the password you shouldn't be able to do much of anything, security is good I don't know of a backdoor either. Do you have the OS X disc?