Solution for PC Won’t Go to Sleep Problem

If your PC won’t go to sleep, check that you’ve got it configured to go to sleep in the first place. Click your Start button, type power options in the search field, and hit Enter. Then click the “Change plan settings” link for the plan you have selected and make sure there is a value in the “Put the computer to sleep” field.

If you’re certain the system is configured properly for sleep, but it still won’t power down, open a command prompt with elevated privileges and at the prompt type powercfg /requests and hit Enter to see a list of items that are preventing the system from going to sleep. Once you’ve found the culprit, disable it (if it’s nonessential) or change its Power Management settings (see above) and your PC should go to sleep.