I have an inspiron 8500 with XP SPK3 on it. The laptop came with XP Pro and the SPK's were added later. I have a buslink CO-80-U2FE that worked with Windows 98 and initially with XP maybe up to SPK2. I use it infrequently so I didn't find out until much later that it is no longer recognized after some of the upgrades. It has an external power supply. When I plug it into the USB port, nothing happens. Same thing when I plug it into another computer with newer OS, hadn't had the opportunity to try older. It doesn't show up in device manager either. Any suggestions for TS steps?