If the port is in working condition and the batteries are good, then it maybe possible that the cable is faulty. At this point, you may purchase a new cable or you can send in the unit for repair service to verify the bad cable. V2.45 and later is compatible with Windows 95. V3.62 and later is compatible with Windows 98. Also, any version previous to V3.62 will not work with the higher speed Pentium II computers.
Software upgrade is recommended.
If you are runnning V3.62 on a Windows 95 or 98 computer, go to your Windows Explorer and find your Dpwin folder in your root directory. Open up the folder and locate a file called hardware.cfg. Rename this file to hardware.bak. Change only the extension. Reboot the computer and follow the rest of the instructions.