G5 troubleshooring: motherboard vs. RAM vs. something else

[amorielljason]

The Apple / Tech Tool Deluxe CD didn't boot, but the hardware test CD did boot.  It seems like it's hung up now, but I received this msg. in the results box prior to it hanging up:

Error Code

2 STH/1/3: CPU A A AD7417AD1

Error Code

I'm guessing that's a really bad thing and not just a bad RAM stick. 

> Do you have the original CDs? I think one is a "dual boot" CD where
> you hold the Option key and it gives an option to boot a hardware
> test. There are also so-called Apple Service Diagnostic discs (ASD)
> that are meant for Apple service technicians to use. You may be able
> to download one from a torrent site, but finding the correct version
> for your specific G5 may be difficult. I believe v.2.5.8 may be the
> correct version, search Google for "June 2004""Apple Service
> Diagnostic" and you may be able to find one, but I don't know it will
> help. Again, I think it's a "dual boot" DVD, so you'll need to know
> how to boot it and use it. Probably not too helpful in my opinion
> because if you need this, you've got a really screwed up Mac that
> needs more attention than an average user can muster.
>