Right lads here is the script.....Received the extra part this morning, switched on laptop then connected the external drive to laptop, this didn't register on my laptop screen which I thought it would do. I then put the snow leopard disc into the external drive, hoping that this would then show on my laptop screen, which again it didn't. I can here the snow leopard disc spinning in the external drive when its connected to laptop. Now I can't even eject the snow leopard disc from external drive, as the external drive has no eject button, so I am assuming I only need to press the eject button on laptop for to eject, but this isn't working either. The little instruction leaflet with external drive states....if the new usb drive does not show in "my computer" when normal steps are finished. Please check if there is "USB Universal Host Controller" in "My Computer/control panel/system/drive manager" if you can not find it, please restart the computer. I have switched laptop off with external drive still connected, when laptop turns back on, the screen stays grey till I unplug the external drive then laptop fires up as normal. When I plug external when laptop is on, everything is fine with laptop, but nothing to indicate that the external drive is connected, even though I can hear the disc spinning when connected. I will probably have to open external now to remove snow leopard from the drive. The bit on the instruction about universal host controller I have no idea how to get to this on laptop. All this hassle just to get my system upgraded to get the latest updates, why can't apple not just allow you to just download the latest updates suitable for your laptop just to access various sites without problems from the internet, nothing is ever straightforward.