Mac Pro 1.1 Asks if I want to shut down after an hour or so of use.

Hi,
My Mac Pro will bring up the shut down dialogue after an hour or so of use. The window won't cancel just reappears.
Previously it was going to sleep until I unchecked 'Allow power button to put Mac to sleep' in preferences. Power button fault?
I've re-set my PRAM and SMC. Changed the battery on the PCB too.
I've tried running a hardware test however I'm using a reasonable but old CRT display and the dialogue box doesnt display correctly, looks brown/orange and illegible. I'm running Lion.
Any thoughts? Power button easy to replace? Can't find much info on doing this.
I wonder if the temperature of the mac is what triggers the fault.
Any help would be much appreciated.
Thanks,
John

Why not run AHT first and see.
I'd say heat and failing RAM would be first.
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