Clean install Snow Leopard

Question

I have a 2006 24'' iMac. It now has serious graphic issues and is not usable at all. I understand this is a known issue witht this model and that it has something to do with overheating and CPU/videocard malfunction. I have tried different OSX versions, but there are problems with all of them.
I do not use this iMac anymore, and i am selling it to guy as a "defect computer" (he is fully aware of that the iMac is non functional).
The iMac has now Lion installed on it. The one I am selling it to, has asked me to install Snow Leopard from a retail DVD I have used on this iMac earlier before shipping the machine.
I have done clean installation of different OSX versions many times before, and this is not a problem.
BUT: How can I do this installation of Snow Leopard without doing the final setup of the OS. I would like that when my buyer start up the iMac, he gets the "Welcome" screen where he sets up an admin account on the computer.
Remember I have to be able to eject the SL DVD for shipping the iMac.

Answer 1

What the buyer is instructing you to do is incorrect and violates Apple's license.
To correctly sell or transfer ownership of a Mac, even to someone in your family, you should follow these instructions.
Disregard anything you are unable to accomplish. For example, Step 6 does not apply because your Mac shipped with discs. The buyer will need those discs. If you no longer have them, replacements can be obtained from Apple for a nominal fee.
Refer to What to do before selling or giving away your Mac
If you enabled FileVault, disable it in System Preferences > Security & Privacy.
"Deauthorize" your iTunes account. Same for Audible if you have one.
System Preferences > iCloud > de-select "Back to My Mac" and "Find my Mac".
Sign out of iCloud. Select "Delete from Mac" when it appears.
Next: Remove all your personal information by completely erasing the Mac's internal storage.
If your Mac shipped with a grey System Install DVD, start your Mac with that disc inserted in the optical drive while holding the c key to boot from it instead of its internal volume, which should be erased before selling it.
If your Mac did not ship with discs, boot OS X Internet Recovery:
using three fingers press and hold the following keys: ⌘(command), option, and R.
With a fourth finger press the power button to turn on the Mac.
Keep the other three fingers where they are until you see the "spinning globe" icon.
This method forces the Mac to download its originally installed OS from Apple's servers, which will not require an Apple ID to install.
Remove any Open Firmware password if you created one: select Firmware Password Utility from the Utilities menu and remove it.
Select Disk Utility from the Utilities menu.
Remove any partitions you may have created.
Select the Mac's hard disk icon, then select the "Erase" tab.
Select the "Security Options" button and erase the disk.
The more "securely" you erase the disk, the longer it will take.
The fastest method is sufficient since all but the most expensive techniques and equipment will be able to recover securely erased data.
When it finishes, quit Disk Utility.
Select Install Mac OS X from the Utilities menu.
An Apple ID will not be required. If a prompt for an Apple ID appears, return to Step 5.
Do not create any user accounts.
When it finishes, shut down the computer.
If you want to install the bundled apps that were included with your Mac, restart by using your Applications DVD if one was included, and install the bundled apps. Apps bundled with newer Macs that shipped without discs cannot be transferred. Its new owner must purchase them from the Mac App Store using his or her own Apple ID.
If the Mac is being sold to someone outside the family consider the following additional information:
System Install DVDs that came with your Mac should remain with it forever, and must be included with the sale.
Consider including your AppleCare certificate if you bought it, printed documentation, even the box if you still have it. AppleCare stays with the equipment and is transferable.
Execute a bill of sale showing the Mac's serial number.
Once no longer in your possession, remove the Mac from your devices in My Support Profile.