Cannot access apple hardware test

Hello everyone,

I have been trying to run a hardware test on my mac pro and while booting the computer up holding down "D" nothing happens.. (excepts boots up slower) so i figured i should boot it up while holding "option+d"and choose the AHT from the internet recovery, but that wouldn't even pop up.it would just boot up like normal.

Aside from the inconvenience of lugging this 50 pound beast into apple, are there any other methods of getting the AHT to work?

Thanks in advance!