How to make a material test

I have a 27-inch iMac made in middle of 2010 running os 10.11.5 and wish to proceed with a trial of material.  When I hold down the option key + d I get a message that my mac cannot run and then test.

Thank you

You will need its origin, gray, The installation of the Applications DVD. It will have the words "AHT version...". "printed on it.

Insert it into the optical drive and then stop your Mac. Turn it on using the power button. Press and hold the D key immediately after hearing the startup sound.

Using Apple Hardware Test - Apple Support

Tags: Mac

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