PC won't sleep under windows XP, windows Vista, windows 7

In Run window type: cmd than press enter, than type "powercfg –devicequery wake_armed", press enter again.
Open run window again and type "devmgmt.msc".
Find any devices listed earlier, then double-click them and look for an Advanced or Power Management tab and see if the device is allowed to bring the computer to sleep. Click ok and close everything.

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