I bought a mac book from a co worker and it did not ever ask me for an admin password, and i did not create one. Then something happened to my battery and i had to replace it, now when i start it it askes for an admin password, that I dont have and cannot not get from the guy i bought it from. How can I bypass this? feeling screwd!

First, check to see if it is stolen at:
Stolen Apple Product Database If it is stolen, contact authorities.
If it is not stolen and you have the OS X Install Disk that corresponds to the version of OS X that you have:
1. Start up off the DVD
2. Choose your language and press Continue once to get into the "Installer"
3. Under Utilties choose Reset Password
4. Reset the password and then restart the computer.
If you don't have a system disk, you need to create a new Admin account:
Enter terminal and create a new admin account: 1. Reboot
2. Hold apple key + s key down after you hear the chime.
(command + s keys 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 /
rm /var/db/.AppleSetupDone
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!

Creating a new Admin on Mac Os X:
Here's how to reset your OS X password without an OS X CD.
the Working solution for me was to create a new admin
you can create new admin like this by deleting a specific file.

You need to enter terminal and create a new admin account:

1. Reboot
2. Hold apple key + s key down after you hear the chime.
(command + s keys 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 /
rm /var/db/.AppleSetupDone
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!

Creating a new Admin on Mac Os X:
Here's how to reset your OS X password without an OS X CD.
the Working solution for me was to create a new admin
you can create new admin like this by deleting a specific file.

You need to enter terminal and create a new admin account:

1. Reboot
2. Hold apple key + s key down after you hear the chime.
(command + s keys 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 /
rm /var/db/.AppleSetupDone
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!

There is no way you can use this accout without password but you can create a new admin account to use your computer.
Creating a new Admin on Mac Os X:
Here's how to reset your OS X password without an OS X CD.
the Working solution for me was to create a new admin
you can create new admin like this by deleting a specific file.

You need to enter into terminal and create a new admin account:

1. Reboot
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 /
rm /var/db/.AppleSetupDone
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!
Hope this helps. Please rate if you like my solution thanks

MAC Admin Hack

Here’s how to create an MAC admin account without knowing the current administrator password.
MAC Admin Hack

You are trying to do something that has been disallowed by the administrator,
To do so you have to have the Admin acces (Admin Password)

As you stated this has been used by someone else earlier, so you have to contact him.

If you cant do that, there is also one more solution. to remove the admin password.

To do so, THE BEST OF ALL is to download the Hirens boot CD, (This is the ultimate tools collection for you PC, and FREE)

Download here, and burn it on a CD, boot from it and goto the Password recovery menu. There are lot of tools in it.

If you don't want to go throught this long process (which i will not recommend, its very usefull CD)

Even though, the tool that this CD uses, and i'v also tested it can be downloaded here.
Its call NTPWD.

Just burn it on CD, or copy in the USB (Boot from CD or USB)

run ntpwd.exe ( it will ask you which account to remove the password ).
Kinda its done, if properly follwed the steps.

If helpful, Kindly Do Rate

just run safemode use administrator while in safemode create password from administrator and save. don't restart pc. then remove first password from administrator while in safemode then you restart pc. the password will gone.

To reset your OS X password without an OS X CD you need to enter terminal and create a new admin account:

1. Reboot
2. Hold apple + s down after you hear the chime.
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 /
   • rm /var/db/.AppleSetupDone
   • 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 you’re good to go again!

The reason that the date is set to 1970 is probably that the pram battery needs charging or replacing.

go into user tolls, system settings, administrator tools, address book management. or use you web browser and for an address type in the IP address of ur machine and log in. the default user name is admin with no password then click on address book.