Where do I find the apple hardware test

Hi, I'm trying to find the apple hardware test. The article here: http://support.apple.com/kb/HT1509 does not help me - I've tried pressing the D key, but the test won't start. My version of Snow Leopard only has one DVD (10.6.3). I rebooted from the DVD and had a look in the Utility section, but could not find the AHT there either. Any help would be greatly appreciated!
Thanks in advance,
Veronika
Edit: OK, I see that it should be located on the original installation disks. However, I never had those - my Mac was once repaired under extended warranty (new harddrive), and they kindly upgraded me from Tiger to Leopard all those years ago. Any other ideas?

Replacement disc(s) from Apple: You can get replacement System Install & Restore CD/DVDs from Apple's Customer Support - in the US, (800) 767-2775 - for a nominal S&H fee. You'll need to have the model and/or serial number of your Mac available.

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