I can not perform hardware test on 2011 imac with mavericks

I unplug all devices from my iMac and held the d key and still can not get to the hardware test. The Mac store was able to perform it with a wired mouse even after I added more ram therefore I know it can be performed. Am I leaving something out?

Read the instructions in Using Apple Hardware Test.
If your iMac shipped with discs, you must run AHT while holding the d key while starting the Mac with its grey Applications Install DVD inserted in the optical drive.
To force the Internet version of AHT to load: with two fingers hold option d while starting your iMac with a third finger.

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