Cannot turn off MBP monitor/display

I have a 15inch MBP running Boot Camp and XP. I am trying to use the "turn off monitor" setting in power options from the contol panel. However when the time is up it does not turn off the monitor...
Also when the "turn off monitor" feature is suppose to trigger, it disables my screensaver.
I don't want my computer to sleep, I just want to turn the monitor off. Right now I just dim the screen until it fades a little but I can still see my desktop screen so I know it is on.
Can anyone tell me how I can turn off the monitor?

Support are now quoting Apple's engineers as saying it is now "expected behaviour" under Lion for the MBP's internal display to reactivate upon opening the lid, even if you want to use only your external display. A new version of the clamshell mode-related knowledgebase article (replacing HT3131) is due shortly confirming this.
This is despite:
- the obvious temperature-related benefits that were achievable (under Snow Leopard) by opening your MBP lid whilst continuing to output solely to, say, a 27" cinema display
- the waste of energy and inefficient use of graphics processing power in needlessly running two active screens (ie if running your MBP in clamshell mode would otherwise make it too hot and/or noisy)
- the negative longer-term impact on the battery and other components from running the MBP any hotter than it needs to be.
If you would like to have the previous behaviour restored, please lobby Apple to change how Lion handles clamshell mode. Options available to them include changing Lion's expected behaviour or adding a user-selectable option within System Preferences.
Feedback can be submitted here:
http://www.apple.com/feedback/macosx.html

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