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Mike
Mike, Mac Medic
Category: Mac
Satisfied Customers: 8997
Experience:  Over 20 years IT experience with Apple computers in publishing, marketing and design.
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I brought a MacBook Air OS X 10.10.4 off of eBay and it did

Customer Question

I brought a MacBook Air OS X 10.10.4 off of eBay and it did not come with a good user code or password. And now I cannot get hold of the seller ?
Submitted: 2 years ago.
Category: Mac
Expert:  Mike replied 2 years ago.

Restart the Mac.

Right after you hear the chime, press and hold the Command and the R keys for a few seconds, then release.

When booting is complete, you'll see a window of "OS X Utilities." You won't do anything there. Instead, you'll go to the Menu bar at the top and select Utilities > Terminal. In the terminal window type the following and hit the Return key.

resetpassword

A new window will open.

Click on Macintosh HD and select the desired user account in the popup. Then enter the new password ***** A password ***** is optional. Click "Save."

Go back to the Apple Menu at the top. Select OS X Utilities > Quit OS X Utilities. That will prompt you to restart the Mac.

If all went well, when the Mac restarts normally, you'll be able to log in to the administrator account with the new password ***** defined.