HT204106 how do I get my keychain password ? I can not access my account

I have recently purchased / hooked up WD passport for mac afterwards macbook would not come on , so I disconnected and finally came on but
no passwords work and will not allow me back into my account only guest user will access ? 

Hello! .
The goal here is to boot your Mac to the so-called Recovery partition where you’ll have a chance to reset your user password.
Here’s how:
1/ Make sure your computer is completely shut down.
2/ You’ll have to be quick next: Press the Mac’s power button. As soon as you either hear the loud chime, or see the display light up - usually after a second or 2 - on your keyboard press [cmd] + [r] Keep these keys on your keyboard pressed until you either see an Apple Logo with a loading bar or a spinning gear.
After a few minutes, you’ll be presented with a Utilities screen. This is the Recovery partition. If this step is already giving you problems, try using a USB-keyboard. It doesn’t have to be an Apple-keyboard. If you have a Windows-tailored keyboard laying around, use the “Windows-flag” key in stead of the [cmd]-key and it should also work.
3/ Find the menu called “utilities” in the top left corner of your computer’s display. It’s in between the menus “edit” and “window” Don’t be confused with the menu called “os x utilities” 
Choose Terminal. A somewhat old-fashioned looking window will pop up, waiting for a text command from you. This is the Terminal.
After the # type: resetpassword and press return. Note that there is no space between ‘reset’ and ‘password’ 
What you’ll see next is an rectangular window that gives you the option to reset passwords. Click on “Macintosh HD” at the top. In the pull-down menu below that, choose your user's accountname. Now enter your new password below that, twice
We’re ready to reboot your Mac now. Click on the Apple Menu and choose “startup disk” Choose to boot from “Macintosh HD” Please let us know if this solved your issue, or if the steps above did not work, or could not be performed for some reason.

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