I bought a new Logitec wireless desktop. If I plug the receiver directly into a USB port on my laptop then everything works. If I plug the receiver into my powered USB hub then the received fails to respond (none of the 3 LEDs light and neither mouse nor keyboard will connect). Note that I am replacing a malfunctioning HP wireless desktop. That old receiver is plugged into the powered USB hub, and both the mouse and keyboard connect. Why won't the Logitec unit work on the powered hub?