By default the Windows 2008 Server Core screensaver will activate after 600 seconds (10 minutes) of inactivity.
To change the amount of time the screensaver waits to activate, edit the following registry key:
HKEY_CURRENT_USER\Control Panel\Desktop\ScreenSaveTimeOut
I changed mine from 600 seconds (10 minutes) to 1200 seconds (20 minutes). more info at : http://expresstaalk.blogspot.in/
Carsten Siemens edited Revision 2. Comment: Pirated Content - see my comment
Richard Mueller edited Revision 1. Comment: Changed tag "Windows 2008 Core" to "Windows Server 2008" and "Server Core"
Maheshkumar S Tiwari edited Original. Comment: Added tags
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Content was taken from: "Howto: Configure the Windows 2008 Server Core Screensaver Activation Period"
Published by Aseem Kishore on March 18, 2008
thebackroomtech.wordpress.com/.../screensaver