Using a pretty nifty trick you can reset a forgotten Mac password without a Mac OS X installer CD/DVD or any kind of boot drive or recovery partiton, and without having an Apple ID. Reset Mac Password – without a CD or Boot Drive
But what if you don’t have an Apple ID attached to the Mac account? Or what if you don’t remember that password either, or if there’s no internet access? If you find yourself in a situation where the Apple ID approach is not possible, don’t worry, because that’s what we’ll cover next. That was easy, right? Indeed, the Apple ID password option is the fastest and simplest method available to Mac users, and when that option is available it’s the preferential method.
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This is the best approach for Mac users running new versions of OS X (Yosemite, Mavericks, Mountain Lion, and Lion) because it’s extremely fast and simple. Resetting Lost Mac Passwords with Apple ID