I am trying to sell my mac.. I did the zero out pass and deleted my trash can of about 500 files and froze for a very long time at 6 files left to delete in trash. I changed the desktop to default and was trying to delete the user login names and accounts and forgot the admin username and password. I don't have the Mac OS X disc install so i researched on yahoo answers this answer: You can try this: 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 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! I did that terminal command.. and it really surprised me when Mac rebooted there was music and the intro of mac of Benivido and different words showing and choosing the language to english. NOW it's asking for a Registration Information??? What?? Ummm does this mean I or it for sure erased all my personal data and all... I am trying to sell this mac. Doe the people that take it have to fill that info or is there a way to bypass. I really need help. I don't know much on MAC. Help?! Thanks. ohh by the way did i do it right??