I have had several Windows XP Pro machines (with SP2 and all subsequent patches... can't do SP3 because of software conflicts) lose their ability to use the LPT1 port. This usually occurs when using a BOCA ticket printer that jams. I know the hardware is working perfectly fine because each time this has happened I either rebuild a computer with the original Ghost image OR completely reinstall Windows XP Pro. I have no device conflicts and all drivers are loaded and seemingly fine. Further, Device Manager shows no issues.