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For troubleshooting purposes, set it to use a different screensaver. It that works, you'll know the problem is with the original screensaver you were using.
If that doesn't make any difference, the most likely cause is something running in the background making Windows believe it's not idle.
When you plan to leave the computer idling, open Task Manager, click on the Processes tab and leave it open on the desktop. When you know enough time has passed that the screensaver should have kicked on, check Task Manager's list of processes to see if you can identify the culprit.
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