Energy Saver?

[macguy at woh.rr.com]

Sorry if I have the wrong list...I'm new to this.  Anyways, I was wondering if there is an energy preference that allows you to set "idle" time shutdown to on or off.  My problem is this, I am running Fedora Core 3 and if I allow the computer to idle for a certain amount of time, usually the screen saver has kicked in, the computer shuts itself down.  My machine is a desktop so I would like to be able to allow the machine to stay on without having press the start button to get the machine up and running again.  Any suggestions would be great.

Thanks!
Jay