Tape Drive Trouble

We have a HP Surestore DLT1 – LynxDLT1 External Tape Drive. There are terminators on the SCSI hard drives, and the Tape Drive. On boot-up, the system detects the two SCSI hard drives, but on detecting the Tape Drive, the system freezes, and does not continue the boot sequence. The ID for the Tape Drive is set to 5 as default. What could be the problem? The SCSI card is and Adaptec 21960N Model (Somewhere in that range…) Please Help.