Dual G5 sleeps when working

My dual G5, running Tiger, has recently developed the destructive habit of going to sleep when doing any kind of 3D rendering, such as with Maya or modo. It will begin to render and within a few seconds, it will simply go to sleep. In the past, I have been able to wake it up by pressing the Return key, and it would resume rendering where it left off--very annoying, but useable. However, the problem has become worse, in that when it wakes up, everything will be frozen and will require a restart. As a consequence, no rendering can be done on the machine.
I have tried resetting the PMU, but that doesn't seem to have made any difference.
Any suggestions?
PS: I have a quad G5 at home, and strangely-enough it has begun to exhibit the same symptoms (however, so far simply waking it up will allow it to continue rendering.).
I suspect the problem may be related to heat, but I am just guessing.

Hi, and a Warm Welcome to the Power Mac G5 Forum!
You could try running Hardware Monitor
http://www.bresink.com/osx/HardwareMonitor.html
to keep a check on what the temps are doing.
You may find a clue in Applications > Utilities > Console > system.log around the time of the involuntary nap. An 'overtemp' entry may look like this:
(Date)(Time) localhost kernel: PowerMac nn,n Thermal Manager: Thermal Runaway Detected: System Will Sleep
or
(Date)(Time) localhost kernel: Power Management received emergency overtemp signal. Going to sleep.
If there's nothing obvious, you could copy and post the log here.
The Apple Hardware Test, explained here
http://www.thexlab.com/faqs/aht.html
may find a problem - or it could be something as simple as a build-up of fluff in the CPU cooling fins.
Good Luck.

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Thanks for the reply, gat0gelat0.
Yes, those settings were the first things I checked. I also tried changing it to "Do nothing", then changing back to the sleeping option. It still does nothing when I close the lid.
I would like the functionality of it going to sleep when I close the lid for the convenience, like when class ends, I have to rush to my next class, I just want to close the lid, put it in my bag and run to the next class. Keyboard shortcuts like Fn-F4 work, but this laptop should have the functionality I am describing, and I want to figure out why it isn't working and how to fix it.
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