Turning off monitor

I'm using my imac as a video server and have eyetv running. I'd like to turn the monitor off at times and I have tried using the shift option up arrow which works for about 5 minutes until something wakes up my imac and the screen turns on. I went to an apple genius and they suggested "kiosk mode" but I can't find any option for turning the screen off. It is a waste of power to run the screen al the time, not to mention light that is turning on and off all night which is a bother.
Is there any way to turn the screen off until I want to turn it back on?

I think there is an answer here: http://www.mactech.com/articles/mactech/Vol.19/19.12/KioskModeFeatures/index.htm l
But, it require some programming effort.
And, there is http://developer.apple.com/mac/library/technotes/tn2002/tn2062.html
And, more http://www.apple.com/downloads/macosx/internet_utilities/saft.html
Surf to http://www.versiontracker.com/macosx/ and search on kiosk

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