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USB Bluetooth Kbd/Mouse Won't Wake Vista Machine!

I have the Dell branded USB Bluetooth keyboard/mouse combo with the Setpoint software v 3.21.29 on a Vista Inspiron 531.  The Bluetooth reciever is plugs into a USB port since Bluetooth is not built in to my machine.  This has worked well for about a year, but suddenly I am unable to wake the machine by moving the mouse or keyboard.  I do have both selected to "Allow this device to wake the computer" under power management tab in the device manager.  Has anyone else had this problem or have any ideas of what to try????

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