Sudden Sleep When Encoding H.264

Hi All,
When encoding H.264 video on my dual 2GHz G5, the computer suddenly goes into sleep mode.
When I try to wake it up, it goes into sleep mode again after a couple of seconds and this continues!
It only occurs with the H.264 codec, not regular MPEG4.
I have tried using various applications, same result.
(QuickTime, ffmpegX, Handbrake & MPEG Streamclip)
Appreciate any help you can give...
Kind regards,
Flemming Bengtsson
PowerMac G5 Dual 2GHz   Mac OS X (10.4.3)  

OK. Gaining.
It may be a hardware issue. You could run the Hardware test (on the Tiger DVD) and maybe it will point out some issues.
I would try your powerful Mac with a different monitor and different cable connections.
The "external" drive test you've already done. And this was done via an "update" to Tiger or a "fresh" install?
What third party hardware could be causing an issue? The monitor? The video card? A bad cable connection?
Last would be the destination location of the save. Have you tried "local" saves and exports?

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    Energy Saver settings: If the computer and display sleep timers are set to Never, the computer will not sleep.
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