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Try this :-
Creating a new Admin on Mac Os X:
Here's how to reset your OS X password without an OS X CD.
2. Hold apple key + s key down after you hear the chime. (command + s on newer Macs)
3. When you get text prompt enter in these terminal commands to create a brand new admin account (hitting return after each line):
mount -uw /
shutdown -h now
4. After rebooting you should have a brand new admin account. When you login as the new admin you can simply delete the old one and your good to go again!
Apple stores wont reset it for you. Computer shops may have charged you $50 to $200 trying to reinstall the Mac.
I'm assuming that you have forgotten your password, if so, here is what you need to do.
1. With the unit turned off, press the power button to power-on the mac, but also hold down the "CMD" and "C" keys on the keyboard at the same time. This will tell the Mac that you want to boot into SINGLE USER MODE.
2. Mac OS will now boot into a unix command line shell. From here you only need to remember your username and then type in the following command-line statements.
In this instance, USERNAME is the username that you normally login as. The "passwd" command will prompt you to enter a new password for the user called USERNAME.
WARNING: Changing your password this way will wipe out any and all keychain passwords associated with your user account. This is a pain, but better than not logging into the box.
Learn how to change or reset an account password in Mac OS X, including the original administrator account password. You might need to do this, for example, when someone has lost or forgotten his or her account password.
If you received an OS X install disk with your used MacBook you can change the administrator password.
1: Boot with the OS X install DVD by restarting the computer with the C key held down. You may release it when the Apple logo appears.
2: When you get to the install menu, select your language
3: Select Reset Password under the utilities menu on the menu bar.
4: When the password pane come up, click on your Hard Drive Icon,
5: Select the original administrator's user name (capitalization counts)
6: Enter a new password for this administrator account (capitalization counts).
7: Re-enter the new password to confirm.
8: WRITE IT DOWN SOMEWHERE!
9: Provide a password hint.
10: Click save.
11: Make sure you reset the home directory permissions and ACLs by clicking the reset button.
12: Reboot your Mac.
If you don't have an install disk, you will have to buy or borrow one.
A finder crash -- periodic blink of the desktop and then a rebuild of the icons and maybe an open window comes back up -- is often due to incompatible add-ons... programs that used to work with an older version of the system or finder, but now don't. We've seen this happen with the likes of 'magicmenu', stuffit avr, and other apps. You can test this by going into your system preferences to the login items and removing all login items,, then reboot your computer. Does the periodic flash of the desktop (or Finder windows) stop? Then something you deactivated was conflicting with the Finder.
And you can't rule out a corrupt Finder preference file (look for com.apple.finder.plist, toss it, and reboot).
paul - afterhoursconsulting.org