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Helpful answers
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May 27, 2015 4:01 AM in response to pure_xaosby Klaus1,Not knowing what version of OS X you are running:
Resetting or changing a password:
For Snow Leopard or earlier: http://support.apple.com/kb/HT1274
For Lion or later: http://support.apple.com/kb/HT6022
For Mavericks users:
http://www.macworld.co.uk/how-to/mac-software/how-change-admin-password-mac-3535 328/
This is also useful:
http://www.macworld.co.uk/ipad-iphone/news/?newsid=3463233&olo=email
If it's running Mac OS X 10.6.8 or earlier, insert a Mac OS X install DVD, restart with the Option key held down, click on it, and use the Reset Password utility.
If it's running Mac OS X 10.7 or newer, restart with the Command and R keys held down, open the Terminal, and use the resetpassword command:
https://discussions.apple.com/docs/DOC-4101
If it is the Keychain password that needs resetting:
https://support.apple.com/en-gb/HT203192
If the computer has a firmware password set, you will need to contact Apple.
Apple’s recommendations on password security:
http://support.apple.com/kb/HT4232
How to change user account name or home directory name:
http://support.apple.com/kb/HT1428