I'm locked out guest user (only one account on my Mac)

I recently bought a macbook model 2013 end pro on eBay and the seller gave me the password for the user "guest".

I changed the password to a blank password that I didn't have a password but I did not create a new user account.

last night I installed clean OS X El Capitan, when installation is complete asked me a password at the login screen.

I managed to pass the login password, but now I am trying to create a new password in system preferences, but I can't because I'm required to use a password to allow the change.

Guest user is the only account on my Mac, so I have no idea what to do to get out of this mess.

Thanks in advance to anyone who can offer support.

You wipe the drive and then do a fresh install of Mac OS X. You can do this via the network of restoration:

Installer Lion through Mavericks

  1. Restart the computer and after the chime hold down the keys COMMAND + OPTION + R until it appears a globe. Wait patiently - 5 - 15 minutes - until appears the Utility Menu.
  2. Select in the Menu Utility disk utility and click on the continue button.
  3. Disk utility charges and select the player (usually, it's the entry Out-bumpy with of the mfgr.) ID and size) of the list to one side. Click the Partition tab in the main window of disk utility.
  4. Under the scheme of Volume defined heading the number of partitions in a single volume. Click the Options button, set the GUID partition scheme, and then click the OK button. Define the type of Format Mac OS extended (journaled). Click the Partition button and wait until the end of the process. Quit disk utility and re-enter the Utility Menu.
  5. Select reinstall OS X in the Utility Menu, and then click the install button.

This should install it the original version of OS X comes with the computer originally.

Tags: Mac OS & System Software

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