Actually you are right it is a 9 pin socket, would be 10 if it didn't have the blank hole. The number of pins on the mother board is 15, would be 16 but that has 1 missing.The plug will only fit in one place and that leaves 2 unused pins on the casing end of the plug and 4 unused pins on he other end. It takes the printer offline and when I switch the computer off and back on the monitor goes into power save. If I unplug the reader, everything works normal again. When the card reader is plugged in the computer says it is a PCI USB device but will need a driver. The power lights on the front of it does not light up.
Richard