AHT begins to load, ejects disc, crashes.

Hello-
I'm having some issues with running AHT on my Early 2008 Mac Pro so I can diagnose some USB port issues. It is running Lion 10.7.3, so I had to copy the .diagnostics folder from the original Install disc that shipped with the computer, to the hard drive using sudo cp -R. After holding "D" at startup, AHT begins to load with the little computer icon and loading bar, then it ejects the disc and displays a blue screen for only a split second that says:
"'apple_hardware_test.acm' exited with 0xffffffff
Status: 0xFFFFFFFF
efiboot loaded from device: Acpi (PNP0A03.0)/Pci(1F12)/SATA(2.0/HD(Part3.Sig24A996E9 [area cut off because I had to record the screen on my phone]
boot file path: \com.apple.recovery.boot\boot.efi"
And then proceeds to boot into Lion Recovery.
Any ideas?
Thanks!
Michael

This is a bit embarassing...
When I went to copy the CPU_AHD file over, an error popped up saying the disc could not be read. Sure enough, upon looking at the disc, it's perfectly flawless except for a small scratch (where I assume the CPU_AHT file lies), and so this was a problem of the media itself being flawed rather than a software or hardware problem. I managed to download AHT from http://www.info.apple.com/support/aht.html with a little modification of another image's URL, since the page doesn't list all of the images that are actually available. Everything is working now, so thank you very much for helping me find the problem!

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