Monitor won't turn off in Vista

So I got the new rig, installed Vista Ultimate and everything is totally working fine.

Except for one little thing - even though I have the power settings set to turn off the monitor after 10 minutes, it never does. I don’t have the screensaver turned on, FYI.

Any thoughts?

Yes, you have a wireless mouse or keyboard installed, and have not applied all the Vista patches.

Until you patch, Vista believes that wireless devices are always transmitting user input, and thus believes you are still in front of your computer.

Correct! I have a wirless keyboard and mouse.

By patches do you mean the ones released today, because I just applied those. I had already patched up to current until these.

It might be an optional patch. Something like Microsoft - Other Hardware - HID Non-User Input Data Filter