DVD drive not detected

There are several possible reasons why a DVD drive may not be detected. First check the power connector attached to the drive, and make sure that the drive is not being powered from a Y-splitter power cable. Next step is, check the signal cable. Both SCSI and EIDE/UDMA signal cables must be attached securely to the drive. SCSI interfaces are complicated a bit by termination, so verify that any SCSI bus is properly terminated. Make sure that the drive is jumpered properly for its SCSI ID or EIDE/UDMA master or slave relationship. Finally, make sure that the DVD drives are installed and running. Check the drives under the Sound,Video and Game Controllers (or CD-ROM) entry of your Device Manager.