Hi, My pc has four usb ports on it, two on the back and two on the front. I plugged my memory stick in one of the front ports last night and the little red light on the stick on the stick came on but the computer wouldn't read anything on the stick. When I plugged it into a rear socket it read everything. What I find odd is that if I plug my stick into an extention usb and plug that into a front socket the computer will read the stick. Not only that but if I plug my printer, modem, stick, or anything else that needs to be plugged into a usb socket into my usb extention it all works when I plug the extention into a front port. Can somebody explain this please?