Power Mac Dual 2.7Ghz rebooting

I have a G5 machine that reboots itself at various intervals when using. It could be on screensaver or using MS word or playing a game. It also seems to be getting worse.
After being shutdown for about 3 or 4 seconds it reboots itself.
I have checked all the fans etc and even gently hoovered the machine out to remove dust. All fans are working and there is no water leakage. When it does shutdown the fans are on but not full. The temperature of the CPU's don't go over 75C during hard usage, when you hear the fans speed up.
Anybody got any idea?
Thanks
G5 2.7Ghz Mac OS X (10.4.6) 3Gb RAM, Twin 450GB Hard Disk

Hello NeilSBarnett, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
Presuming that you are not seeing this screen
http://docs.info.apple.com/article.html?artnum=106227
and that you have not recently added any new hardware, you could have a look at Applications - Utilities - Console - Logs: system.log and console.log for unusual entries at the time of the shutdown.
The symptoms sound similar to those of a RAM problem.
However, before opening up the G5, you could boot from the system DVD and Repair Disc and Permissions
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1018.html
and run the Apple Hardware Test
http://www.thexlab.com/faqs/aht.html
Note that the AHT does not find all RAM problems - you may have to try running with just the supplied original RAM - and maybe re-seating that. The RAM D-I-Y instructions are here
http://www.apple.com/support/powermac/doityourself/memory.html
You could try disconnecting all non-essential peripherals and leaving just display, wired 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 PMU
http://docs.info.apple.com/article.html?artnum=300341
Note static precautions and the warning to press the button once only.
But first of all - check the logs.
Please post again with anything you find in the logs, and the results from any other things that you try.

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