Hm...I'm not by my TS at the moment to try it out, but you might try this (it works on laptops):
Go to Start->Control Panel
Click 'Classic View' on the left and open 'Power Options'. On the left there is an option to adjust monitor brightness.
Like I said, I don't know if it is there on the TS since it is a desktop, but you might give that a try.
--Andrew
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