In the past we have used the managed preference "Login Window Screen Saver Idle Time" in order to try disable the screen saver at the login screen. It has never worked and it has been some time since we last looked at this. I am revisiting this again now as we are in the process of reimaging our IT suites. We have tried the managed preference again which set the plist com.apple.screensaver loginWindowIdleTime but still it doesn't work. Does anyone know of any other way we could disable the screen saver please?