Can't unlock any settings or install apps

Discussion in 'OS X Yosemite (10.10)' started by patrykw, Dec 28, 2017.

  1. patrykw macrumors newbie

    Dec 28, 2017

    I have a problem authorising any admin tasks (like installing new apps, unlocking system settings etc.). I have an admin account with a password, yet the system won't authorise it. The prompt just shakes around as if the password was incorrect. However, I'm able to log into my account without problems, so I assume the login details are fine.

    I've noticed that the "Username" field is blank by default (while usualy it's already there when the prompt appears) - please see the attached image file. Even if I type the username manually, it still wouldn't work.

    Not sure what to do about it, I've never seen anything like this. Any help would be much appreciated!

    Attached Files:

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