G5 won't run AHT....systems freezes. Any Thoughts ?

Hi All,
I am trying to figure out what is going on with a G5 I have at work. Coworker says machine just freezes multiple times a day while she is working on it. I ran Tech Tools last week and it did not show any problems yet the freezes continue. So today I tried to run AHT version2.1 (G5 is running Tiger 10.4.8) and I can not get it to run. I first tried the extended test and on the first try it froze at 5 min 40 secs on the mass storage check and gave text in the screen top upper left ending in "ok". I restarted the machine and ran extended test again, this time it froze at 4 min at the logic board check again giving text ending in "ok".
Then I tried the quick test twice. First time it froze at 11 secs at the logic board check. Second time it froze at 2 and a half mins again at the logic board check. The text again was in the upper left of the screen and the message said something about "invalid memory access at....and gave a whole string of numbers which mean nothing to me.
So, does anyone have any idea what is going on with this machine? Do I have a RAM issue....this machine is mainly used for Photoshop work I had apple care on it but it expired 3/06 so that is no help. I will have new macs in a few months but am trying to keep this one running until they come in.
G5 Mac OS X (10.4.8)

AHT on the original install disks/Tiger disks doesn't get updated with OS and firmware changes.
The Genius Bar has access to the latest versions of AHT.
Clone your hard drive (Superduper) to a new drive that you have Disk Utility>Zero-ed already and hold option to boot from the clone and see if your problems continue.
Your problem could be hard drive, corruption in software, bad memory, PCI cards, external devices and so on.
Only with a process of elimination can you solve your problem.
Hope that helps.

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G5 won't run AHT....systems freezes. Any Thoughts ?

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