Mac mini falling alseep despite system settings to the contrary

I have an intel core-duo mac mini which I need to keep running on a continuous basis. I have set the Energy Saver settings to sleep never and have ensured that the Security setting for auto-logout is also disabled. However, after a period of inactivity, the machine seems to go into a kind of logout & sleep mode--I can wake it back up by pressing a key or moving the mouse, but I hear the system start "bong" sound, and it comes up with a login screen that starts a new user session (the session I had running seems to have been ended).
I've tried resetting the SMC according to http://support.apple.com/kb/HT1543, but that hasn't helped.
I thought this might be due to overheating, but it seems to do this when the machine is sitting idle as well.
Is there some setting I've missed? How can I stop it from doing this?

I see that I am not the first to ask this:
http://discussions.apple.com/thread.jspa?threadID=1005729
Has anyone ever found a solution to this? I've now reset the PRAM, reset the SMC, verified the settings with pmset, and have even tried running "pmset noidle" in a terminal. Despite all this, the mini falls asleep after a while.
Any ideas?

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