On Mar 23, 12:19 pm, googlegro...@trailer.net wrote:[color=blue]
> We're trying out Vista Business on a few PCs here. One PC in
> particular is left on each night, but appears to either be rebooting
> during the night or just logging off the user. The logged in user is a
> domain admin and the desktop is left locked. There aren't any
> indications of what's happening in the event logs. All apps get closed
> without saving files that were open. This is a 6-month old Dell
> Optiplex with 3GB of RAM and seems to run Vista fine otherwise. We've
> got 30 XP Pro PCs in the office that are on 24/7 and never log users
> off like this. Does anyone have any idea what might be causing this
> issue?
>
> Thanks,
>
> Mike[/color]

I am not sure what might be happening. I suppose it could be a power
issue. (janitor unplugs perhaps?)

You said you have looked at the logs. Have you looked at the
Relilability and Performance monitor and clicked on the Reliability
Monitor subsection and look at the System Stablity Chart to see if
this says anything? ( I know this is kind of like looking at the
logs) A power yank should show up here as a disruptive shutdown
(other things can cause this message too)

Also (this is kind of silly) but parental controls can force a logout
as well as settings in the domain controller,

Probably not much help but good luck