Currently Being ModeratedJan 11, 2013 6:51 AM (in response to Sean Booth)
You can't do that because it will always be associated with your Apple ID.
The proper way to "clean" a computer before selling it is to zero the hard drive. This will make all your data irretrievable.
Steps for zeroing the drive Disk Utility:
1. Insert your Mac OS X CD-ROM disc or Restore DVD disc, then restart the computer while holding the C key until you see the spinning gear.
2. Once started up from CD or DVD, choose Disk Utility from the Installer menu.
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from disc to access Disk Utility.
3. Choose the entire disk (top icon).
4. Choose erase tab.
5. Click on Options
6. Choose "write zeros".
This will take a bit of time because the computer is physically writing zeros to each block.
You should then re-install the original OS from the system disks and deliver the Mac to the new owner with the system disks that shipped with it.
If you want it to boot as new at startup, do the installation of OS X and follow the onscreen prompts until it asks you to enter a username and password to create your first account. Quit the installer and shut down the system. The next time the system is powered on it will display the same welcome message and be ready to setup OS X.
Currently Being ModeratedJan 11, 2013 6:52 AM (in response to Sean Booth)
You need to sell the iMac with the OS that came with it. Use the OS installer disks to do that on the new hard drive. You are the licensed owner of Mountain Lion. Let them purchase upgrades on their $$.
Currently Being ModeratedJan 11, 2013 6:59 AM (in response to sig)
Ok great – I can’t beleive you can’t upgrade to Mountain Lion and just pass on the licence – it’s all paid for. What does it matter who it is licenced to if its been legitimally bought? It would make the Mac more desirable to purchase with everything up-to-date.
Thanks for the quick replay.