My early 2011 15" macbook pro won't run AHT at startup when holding 'D' help???

when i first got my macbook 2 month ago after i put all my stuff onto it i ran a hardware test by resetting the comp and holding 'D' before the chime (i think, not quite sure which botton i pressed it was a while ago) anyway i forgot how to do it so i looked online n it said hold D when restarting, so i did this and nothing happens!!?!?! any advice please?

Since you are using Lion, you better read this thread - https://discussions.apple.com/thread/3217292?start=0&tstart=0 or post in the Lion forum area.

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