Removing all prior info from imac we sold

We purchased a new imac from the Apple Store online which will arrive in a few days. Our G5 iMac has been sold and we would like to prepare it so that all personal information and files are removed before the new owner picks it up. Please assist us in removing anything of personal nature on it. We are leaving the application programs we installed in it.

If you want to leave the current OS and apps as is, you have to first remove all personal data files.  You can create a new admin user account in System Preferences Users & Groups pane.  Make sure it is Admin.  Log out and log in to the new user account.  After making sure everything works as expected from that new admin user account, delete the old user account(s).  If you kept all of your user data in the user home folder, this should erase your personal data.  Be sure to provide the user name and password for the new account to the new owner.
Note:  It is possible that some personal data will remain, because you don't know it's there, such in cache, log files, and other files used by the OS and apps.  Also, if you intentionally placed personal data outside of the user home folder, you will need to find and remove those folders and files manually.
To ensure the erased files cannot be recovered (using common data recovery tools), do the following:
Run Disk Utility.
In the sidebar, select the iMac's internal drive volume.  Select the volume, indented under the drive, not the drive. It is named Macintosh HD, unless you renamed it.
Go to the Erase tab.  Click the Erase Free Space button.  Using the fastest option (one pass), it will write zeros over all the free space, which makes the data unrecoverable (except by highly specialized tools that most people do not have access to).  If you are "paranoid," you can select to do more passes (takes longer).  Click the Erase Free Space button.  This can take some time, depending on the size of the volume and amount of free space.
You should provide the original discs that came with the Mac to the new owner.

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