HT202860: Change or reset the password of an OS X user account

Learn about Change or reset the password of an OS X user account
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Q: I can use my administrator password to open my Mac but this password is not accepted to unlock when I want to change System Preferences. An important reason why I want to change is that Date and Time preferences were changed without my input - believe it

I can use my administrator password to open my Mac but this password is suddenly not accepted to unlock System Preferences. Date and time preferences were changed without my input - believe it or not but my EST was changed to PST and I am not able to correct the time zone!

MacBook Pro, OS X Yosemite (10.10.2)

Posted on Feb 19, 2015 2:55 PM