I have Windows 7 x64 installed and sometimes it will not go into an idle state allowing for the monitor to turn off. I keep shutting down services and programs, but I can't pinpoint what is causing the issue. Is there a utility that I can run that will tell me if the mouse is moving or something is resetting the idle period?
will scan your system and give a full report on the power state. Look for any errors or warnings in the output.