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First you should unplug all devices (incl. cables) behind the dongle and check once more if the dongle can be detected. If the dongle can be detected, you should insert a second parallel interface card into your computer and plug the dongle into this interface. If you can still not detect the dongle when it is plugged into the parallel interface alone, you should make sure that the parallel interface is set to Standard, Compatible or SPP. You can usually set up parallel interfaces which are integrated into your computers motherboard using the BIOS settings. But if you are using an interface card, you will have to change the mode using so-called jumpers on this card. If you can still not detect the dongle, check on another computer or on another parallel interface if the dongle can be detected there. Our recent experience has shown that the dongle is hardly ever faulty, but the parallel interface to which the dongle is plugged in is not working properly. Note: You must never plug a dongle into a serial or SCSI interface as this could damage the dongle.
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