Among a host of power management options available in Windows 7, sleep mode is a convenient way to save power and reduce wear and tear on your computer’s hardware while it isn’t being used. Unfortunately, your mouse is set by default to wake up Windows 7 from sleep mode.

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Prevent a Mouse from Waking Windows 7 up from Sleep Mode
Windows 7 not going into sleep mode is most likely an issue with your power settings, drivers, or files from a previous install. However, you should be able to troubleshoot and find a solution to your problem in a couple of easy steps.

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Troubleshoot Windows 7 Does Not Go Into Sleep Mode
A new issue I’ve seen going on with some Windows 7 users is that their taskbar will suddenly disappear completely. The only thing that remains is the Start Menu button/orb.

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Windows 7 taskbar disappearing?
In Windows 7, if you want to enable hibernation, it’s not as easy as it used to be in Windows XP. Now if you go to Power Options in Windows 7, there is no longer any tab for Hibernate.

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Windows 7 – Enable or disable hibernation