Disable sleep at Windows logon screen when no users logged in

Hi,
we have a number of Windows 7 PCs on our network, which, when at the logon screen, we would like to prevent them from going to sleep. Ideally this would be done using a group policy.
This needs to be either when the PC has been switched on, but no one has logged in yet, or if a user has logged off and is waiting for the new user to log in. I've seen how this can be done via Power Options, selecting options such as never sleep, never hibernate, etc., but those settings only seem to be in effect if a user is logged in.
Any suggestions would be appreciated.
Thanks
Graham
jack1884Asked:
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omgangIT ManagerCommented:
According to this EnergyStar article, https://www.energystar.gov/index.cfm?c=power_mgt.pr_power_mgt_enterprises_winVista , GPO for energy management applies even when no one is logged on to the computer.

See this TechNet article, http://blogs.technet.com/b/askds/archive/2008/03/17/managing-power-with-group-policy-part-1-of-3.aspx , for info on the various GPO settings pertaining to power management.  Part 2 is where I think you'll want to concentrate.

OM Gang
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