I've got an extra computer in my office that gets used very rarely. But an assistant usually comes in once a day to use it very quickly and then leave. It's a very noisy computer, so I usually end up putting up with the noise for a couple hours before I get fed up and turn it off.
I'd like a piece of software that activates like a screensaver, and quietly shuts the computer down. All of the software I've found that comes close is pretty clunky and requires a taskbar or systray icon, and generally hasn't worked like I would like it to. I'm basically looking for a piece of software to shut down the pc after a half hour of idle time.