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When I bought my Mac mini, I got it without the installation disk and I also didn't get the administrator password. Is there a way to find out in my computer the admin. Password and get a system install disk for it?

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This is really two questions. I would suggest asking them separately: "How can I recover my administrator password?" and "How can I get a system installation disk?" – Flimzy Jun 19 '11 at 21:47
In general, it's also helpful to include what version of Mac OS X your computer is running, if you know it. – jtbandes Jun 19 '11 at 22:48

If the machine doesn't have an Open Firmware Password set, you can reset the password with single-user mode (if it does, you won't be able to access single-user mode without entering the Open Firmware password).

  1. Hold down +S while rebooting the machine. Wait for the machine to boot into single user mode and you will see a # prompt.
  2. Run fsck -fy
  3. Run mount -uw /
  4. Run launchctl load /System/Library/LaunchDaemons/
  5. Run dscl . -passwd /Users/username password, where username is the administrator username and password is the new password.

(Source for the instructions)

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