Why can't I run Hardware Test?

I am trying to figure out if I have a hardware issue and was told to run the Hardware test. my iMac is the late 2010 model and shipped with Mac OS X (10.6.4) and currently upgraded to Mountain Lion 10.8.3.
I have tried running test by restarting and pressing "D", option "D", and both ways with and without the original applications install DVD in. But every time I just get the login screen that I normally get. Am I doing something wrong?
This is above my pay grade, but I am having trouble running Adobe's Illustrator and a colleague using the same set up said they had the exact same issue and it turned out to be bad RAM. So, I am trying to run the hardware test to determine if I have a hardware or software issue.
Thanks in Advance,
Rob

See this thread and baltwo's directions, which will enable you to start the AHT directly from the boot volume, that is if the AHT (.diagnostics) isn't already present.
https://discussions.apple.com/thread/4427984?start=0&tstart=0
But first, using the starting suggestion there, unhide hidden folders and see if you have .diagnostics in the given location. If you don't, then proceed with the rest of the suggestions, but be sure to use the corrected Terminal command later in the thread.
Still, disc 2 and the D key should work. Don't know why it isn't.
Also, if you just want to test the RAM, get Rember. But close all applications first. It may be necessary to run several loops before it finds anything.
http://www.kelleycomputing.net/rember/
Message was edited by: WZZZ

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