I have a USB Razer Copperhead mouse, which is excellent, apart from one strange problem; on the DOS startup screen for Windows, it will stop just before the hard drive information is displayed. I have to unplug the mouse, and it continues the boot-up. I then plug it back in and it is fine. It has done this for as long as I can remember, but all I can think is that the boot-up sequence doesn't like the USB slot. I have tried the older connection for a mouse ( cannot remember it's name, the adaptor jack is bright green) and it just doesn't recognise the Razer as being plugged in.