It could be due to several things
Windows 7 Tips: Enable or Disable Screen Saver
I have had my share of problems with Windows 7, but I still use it regularly with my MacBook Pro. A new problem that recently popped up has to do with the screensaver and the power options. I set my screensaver to start after 10 minutes, but nothing happened! I also set my PC to sleep after 1 hour and turn off the screen after 30 minutes. For some reason, the screen turned off after 30 minutes, but the computer never went to sleep!
If you are having problems with your monitor not turning off or your computer not going to sleep at the time intervals that you have set, this could be caused by a number of different issues. In this article I will attempt to walk you through all of the different methods that I have tried and hopefully one will work for you.
Also check out my other posts, The Ultimate Guide to Fixing Sleep Problems in Windows and Windows 7 Won't Sleep, for other possible solutions.
