Dell Vostro Desktops Hibernating Even Though Power Options are set to "Always On"

I have computers on an array for remote access.  Because I have a lot of users that may be logging in remotely at all hours of the day/night, I need to the computers to stay on all the time.  

I have gone into Power Management as the computer and network administrator and changed the option to "Always On".  I've even disabled the check box that says "Enable Hibernation".  But regardless of what I've done, the computers still go into sleep mode/hibernation during the night.

How do I stop this from happening and keep them turned on 24/7?
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And you have changed all your power scheme options to 'Never'? Check your BIOS options.
Ah, are your users choosing to 'Shutdown' when finishing their session. And your power button option is set to hibernate on shutdown? There is a way to only allow logoff.
"Group Policies at gpedit.msc - User Configuration - Administrative templates - Start Menu and Taskbar - Remove and prevent access to the Shut Down command."
Brian GeeCommented:
Go into Power Options and make sure the Put the computer to sleep option is set to Never.

If you're using Windows 7, you'll have to click the Change when the computer sleeps link before accessing this setting.
Try disabling it from a command prompt:

cmd (enter)

powercfg.exe /hibernate off (enter)

exit the command prompt and test

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Windows XP

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