Sleep Problem


I have a powermac G5 2x2ghz that goes to sleep intermittently without any prompting. I'll be working and it suddenly goes into sleep mode--it will reawake but then, with the move of the mouse, back to sleep. Some days it works fine, so there doesn't seem to be any rhyme or reason as to when it will fail.

I've tried turning off all energy saver features and unplugged most external devices but haven't nailed anything down specifically. Just wondering if anyone has had this issue and if there are any readily available fixes. My next step is to start unplugging externals, but really need all those in my system. Thanks