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Possible Duplicate:
Windows 7 PC no longers goes into power saving mode

I have a windows 7 x64 machine which is scheduled to go to sleep after a certain amount of inactivity. Recently it has stopped going to sleep when it is supposed to be.

How can I troubleshoot this and find out what is stopping it going to sleep?

Is there some application I can run which will tell me which app is denying sleep?

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marked as duplicate by Ƭᴇcʜιᴇ007, Mehper C. Palavuzlar, Tom Wijsman, random Aug 12 '10 at 17:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

@TomWij, troubleshooting tag? Really? isn't that a meta tag? – Sam Holder Aug 12 '10 at 12:41
No, then [windows-7] would be one too. The content of the question requests troubleshooting and it doesn't mean different things to different people... – Tom Wijsman Aug 12 '10 at 13:25
up vote 2 down vote accepted

You could use the command powercfg (command line) that is available in Vista and Windows 7. See this technet article about troubleshooting power management using the powercfg tool.

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