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Message: <blockquote data-quote="chscag" data-source="post: 1609504" data-attributes="member: 46727">You're referring to someone who has access to your iMac being able to boot to the recovery partition and changing your login password.  Yes, this is possible.  The only way to avoid that from happening is to use a <a href="http://www.cultofmac.com/262215/make-mac-even-secure-firmware-password-os-x-tips/" target="_blank">firmware password</a>.A word of caution:  If you forget your firmware password, you may be locked out of your Mac with no way of getting around it.  Newer Mac's firmware password can only be bypassed by an Apple technician.  You will have to provide proof of ownership of the Mac before they will do it.Anyway, I don't know why you're worried over this.  Isn't your iMac secure in your home or office?</blockquote>