Hardware Test on MacBook Pro running Mavericks not working, Help!

Hi Folks,
I am hoping someone can help me get the Apple Hardware Test working on my Mid-2012 MacBook Pro (model 9,1) running OS X Mavericks v10.9.5.
It came with Mountain Lion pre-installed. I successfully ran Apple Hardware Test when I received it by holding D while powering up. No problem. Since then I have done nothing involving OS X other than installing Mavericks.
Recently I have installed some RAM and wanted to test it. I find the Apple Hardware Test no longer works. The mac simply boots into the username screen as usual.
Here's what I've tried:
0. Reading instructions on Using Apple Hardware Test - Apple Support. Ensured Mac was plugged in, and confirmed I pressed D prior to grey screen, and confirmed I held it down. No effect.
1. Pressed Option-D while powering up. No effect.
2. Searched for .diagnostics directory in /System/Library/Core Services/.diagnostics
It didn't appear to be there. (I don't know why, I can only guess that the upgrade from Mountain Lion to Mavericks must have hosed it)
So, I found instructions on how to obtain the AHT .dmg file for my version of MacBook Pro and downloaded it.
It's at this link by the way:
http://download.info.apple.com/Apple_Hardware_Test/022-5879-A.dmg
Then copied the .diagnostics directory from the .dmg into the /System/Library/Core Services/ directory on my HDD.
Tried again, pressing D after powering up. No success. Option-D, same thing.
So, I don't know what else to do. IEverything I have read indicates the test should run. It doesn't.
Can anyone help?
BTW: I don't have an install disk. System came with Mountain Lion pre-installed and I subsequently upgraded to Mavericks a while later.
Thanks in advance,
- BS

Forget the code yoyu have a hardware problem. Only Apple, or a AASP, knows the codes and what they mean. Take it to a genius bar.

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