I have found on a few occasions that windows 7 doesn't want to shut down properly.
1. First check for any USB devices such as printers that are usually plugged in, ensure they are. Even if the USB is plugged in make sure the power cable is also.
2. If your computer has a firewire port, you will need to check in device manager if it is set to allow the computer to switch off the device. You can do this by going to properties of the devices under IEEE1394 Bus host controller and going to power management. After that, make sure the "allow this computer to turn off this device to save power" is ticked.
"Windows Start Button" >> Control Panel >> Hardware and Sound >> Device Manager >> IEEE1394 Bus host controller (expand) >> double click "VIA 1394 OHCI Compliant Host Controller" (this could be different on your machine) >> Click on "Power Management" tab >> Check the box "Allow the computer to turn off this device to save power" >> click "OK".
Another possible solution is to try these steps:
1. Start
2. control panel
3. system and security
4. power options
5. change plan
5. change advanced power settings
6. scroll down to USB
7.click USB setttings
8. click USB selective suspend
9. Disable
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