Reference Dell with Vista/64 won't go to sleep by himself.

I have a 3-year-old Dell running Vista 64 desktop computer.  I've only used the sleep (or hibernation... can't tell them apart) mode manually, using the keyboard command: [Fn] + F2 on this old HP keyboard.  It works fine, the machine goes to sleep, to be awakened by the mouse or any key, asking for a password for the connection.  Large.  But I set Power Options to get the machine going to sleep if she has been preserved for an hour, and he won't.  The screensaver comes on after 5 minutes as it should; the monitor turns off after 20 minutes, what is right, but the computer won't go to sleep.  What I'm missing here?  Thank you very much.

UPDATE: the problem has been resolved.  The first reference cited by Robert gives two options: a manual change to the computer (registry?) via start/run and typed in command in the folder C: / / command prompt, or a downloadable "fix" to the millisecond.  I had tried the manual, but then returned and did the download.  The downloadable patch is obviously more than one manual, and it solved the problem.

Tags: Windows

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