My problem seems to be the same as yours. I have the Power Options set to “Balanced” Turn off display in 10 minutes & Put computer to sleep in 30 minutes. I have the battery options set to “Never.” Yet whatever is happening, seems to happen randomly. Meaning that after few sessions with computer, the monitor does not shut off. It works, and then it doesn’t work. I need to reboot the computer to get it working again. I’ve been on the phone with Microsoft Support to resolve this problem; and they keep switching around the drivers. I know that one day this issue will be resolved, Windows 7 is still new. It shouldn’t happen nether the less. I’m going to start by unplugging my wireless mouse & keyboard to see what happens.