I have a firmware password set using the Firmware Password Utility.
When I hold D immediately after power-on to start Apple Hardware Test, nothing happens. My computer boots normally.
How can I start Apple Hardware Test?
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Your firmware password must be disabled to start Apple Hardware Test. To do this:
Either boot into OS X Recovery (hold ⌘+R while powering on) and select Firmware Password Utility from the menu, or follow these instructions.
Select "Turn Off Firmware Password...":
Enter your firmware password to disable it:
Select "Quit Firmware Password Utility":
Restart your Mac and attempt to launch Apple Hardware Test again with D.