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HT4798: OS X: Apple ID can be used to reset your user account password

Learn about OS X: Apple ID can be used to reset your user account password

HT4798 username/password not working after upgrade to mountain lion

684 Views 8 Replies Latest reply: Jan 19, 2013 10:02 AM by anticafase RSS
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Jan 5, 2013 6:02 PM

hello, on my imac after upgrading to mountain lion my computer password and/or username seems not to work anymore: when i want to install an update or search for updates on the app store the combination i used so far, does not work anymore. i tried to find out how to reset the computer password but without too much success, and i'm a bit confused, what can i do? thanks a lot

iMac, OS X Mountain Lion (10.8.2)
  • Linc Davis Level 10 Level 10 (108,150 points)

    In the Users & Groups preference pane, there's a checkbox marked Allow user to administer this computer. Is it checked? If not, do you have any other user accounts?

  • Linc Davis Level 10 Level 10 (108,150 points)

    You went wrong at the very beginning by not erasing the hard drive of a used computer before starting to use it yourself. I suggest you do that now.


    Back up all data to at least two different storage devices.


    Boot into Recovery (command-R at startup), launch Disk Utility, and erase the startup volume. This operation will destroy all data on the volume, so you had be better be sure of your backups. Install OS X. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.


    When you reboot, you'll be prompted to go through the initial setup process. That’s when you transfer the data from one of your backups. For a walkthrough, see here:


    Using Setup Assistant


    Don't transfer the Guest account, if it was enabled on the old system.


    Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.

  • Linc Davis Level 10 Level 10 (108,150 points)

    can i try to erase the startup disk, re install osx, and then place back my files without problems?


    I have no way of knowing that. You obviously have a damaged system and I don't know why you're unable to back up in the usual way. If you didn't back up when your system was working normally, there may be no easy way out now.


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