This is weird and is affecting two of my Win7 Home Premium machines. In power options, I have set the "Turn off the display" to "Never", and "Put the computer to sleep" to "Never". On PC A, it would still turn off the screen and went to sleep after some time of inactivity. On PC B, it would turn off the screen, but did not went to sleep after some time of inactivity. Why is this happening even though both options were set to "Never"?

As strange as it may seem (but no guarantee) if you have a graphics chipset or video card it may be that your video driveris not 100% compatible with the windows 7 API.Forceupdating thevideo driver from themanufacturer'sweb site may improve performance.

This is related to the power management that is controlled by ACPI. The root cause can be hardware compatibility. Please download the latest BIOS and video adapter driver for the computers. However, since currently most drivers are for Windows Vista, if the issue is not resolved by the new drivers, we may need to wait for compatible drivers from the manufacturers.Arthur Xie - MSFT

This is weird and is affecting two of my Win7 Home Premium machines.In power options, I have set the "Turn off the display" to "Never", and "Put the computer to sleep" to "Never".On PC A, it would still turn off the screen and went to sleep after some time of inactivity.On PC B, it would turn off the screen, but did not went to sleep after some time of inactivity.Why is this happening even though both options were set to "Never"? Check to see if the Screen Saver is still enabled (to display the Blank screen saver).