someone changed my password

I assume you meant that you do not know the new user password.

This is what should do it:

EDIT: I have taken it out again.

I advise you to google it.

tcoogler wrote:

How do I reset my password that someone else has changed on my Macbook Pro?

Put your original disk in the drive and boot to it, under utilities reset your password.

Instructions here > Mac OS X: Changing or resetting an account password

Hi C and Carolyn and tc, this solution is good, and works only for those who have the original disks and know the "old" password. Good work.

The method I "took out" I wanted not be published after all, because it works without the original disks and without knowing the original password, so also a stolen mac could be entered.

See you around.🙂

No, the instructions they posted do not involve knowing the old password. And since Apple has posted the instructions on their own web site, they obviously think it's okay for that information to be out there.

HI Lex

It is not necessary to 'know' the old password, just having the disk is enough.