Hardware self test won't run ??

I want to run the apple hardware self test on our iMac OS 10.10.2 Yoshemite. However when I switch on holding the D key down the self test does not load, the computer just starts up as normal. Any other way to so the hardware test or resolve the issue ?
Cheers
Brian.

Brian,
You will need the original install discs that shipped with the computer, if you cannot locate them call AppleCare and for a nominal fee they will replace them. You will need the computers serial number and a credit card. If you don't know AppleCare's number start by clicking AppleCare Contact Info

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Hi Amanda Marvin!
Try running the Apple Hardware Test by using the steps listed in this article about AHT:
Using Apple Hardware Test
http://support.apple.com/kb/ht1509
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Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
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Solved!
Go to Solution.

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Hardware self test won't run ??

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