that something is running in the background which tells the OS that it is 'not yet idle'.
First guess would be Windows Indexing Service.
I just got my new computer set up. It has Windows 7 Home Edition. Have set up my DISPLA charactistics for screen saver and power options. But none of it works. I have set power option to go off after 10 minutes but when I leave the computer for a while, it stays on. I also set up my screen saver with a photo file and set to come on after 1 minute but it does no. Have looked at troubleshooting guides in various places but they all talkabut setting the parameters. What am I doing wrong or not doing? Need some help.