G5 Quad Shuts down Automatically

Hi, i have a G5 2.5GHz Quad, i am using it for Final Cut Studio.
My problem is, when i am working on any application, the system shuts down automatically. once replaced the RAM it worked fine, but now again the same problem.
i would really appreciate if anybody can get me out of this problem.

On the basis of the info. you have provided:
I have not found an Official Explanation of the "PMU -122" error code.
As RAM changes provided a temporary fix, you could try -
Run the Apple Hardware Test and Memtest - link at the bottom of page here
http://www.thexlab.com/faqs/aht.html
Note - it doesn't find all RAM problems.
If no problems are found
Remove any RAM that was not supplied by Apple with the G5.
Also you could disconnect all non-essential peripherals and leaving just display, keyboard and mouse; unplug from the mains and leave for at least 30 mins; re-connect mains plug to G5(to earth the casing), then reset the SMU/PMU
http://docs.info.apple.com/article.html?artnum=300341
Note static precautions and the warning to press the button once only.
Then boot from the supplied system DVD and Repair disc and permissions
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1018.html
If after this, the problem does not re-occur you could try progressively replacing the additional non-original RAM in pairs and see if it still runs ok at each stage.
If none of this helps, it may be time to contact AppleCare.

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