Hello, when I loaded SS1.5 my MD was not connected, so that couldn't cause the problem. I was away for the weekend and when I switched the MD back on, it was functioning normally (thanks already). However, I loaded SS4.0 and the problem persists: I switch on my laptop and plug in the USB of my MD and ... nothing happens. I do not get a "new hardware detected" message etc. (although installation of SS4.0 was succesful) and according to the help file I should look at "other devices" in my device manager, but there is no such category. Also, I can not use the "safely remove hardware" because it doesn't show the device. When I unplug it, again the MD>>PC sign is there again and disappears when I plug in again. Could you please give me any other advice??? thanks