How to get external monitor to obey Energy Saver settings

I have a 23 inch Apple Cinema Display connected to a 2010 15 inch 2.8 GHz i7 MacBook Pro running Mac OS X (10.6.5). I'm running the laptop in clamshell mode. Everything is working fine, but for one thing. For some reason the external display does not obey the Energy Saver Control Panel settings. I have the Energy Saver Control Panel set up so the laptop never sleeps but the display is set to sleep after 5 min. of inactivity. Unfortunately the external monitor never sleeps.
Anybody know how to get only the external monitor to sleep in clamshell mode?
Thanks…
Dragon Dictate in use. Occasionally mistakes are made. I correct the ones I notice…

Basically, reinstall the Boot Camp video drivers manually and if that doesn't work then go to the AMD/Radeon website and install the Windows drivers directly for your video card model.
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