Tape library hangs on a 'Checking' status with a 'ASC 00 ASCQ 00' error. (4038546)

Tape library hangs on a 'Checking' status with a 'ASC 00 ASCQ 00' error.

Environment details:
NetVault Server: 9.2 RedHat Enterprise 5.
Backup Device: Quantum Superloader 3 tape library (FW: V91.0 005B.0H) with an LTO-5 drive (IBM HH 5 TS2350 FW: D8D5) and connected to the NetVault Server via SAS.
The SAS cable from tape library is attached to SAS connector on mother board and not via a separate HBA, as that HBA was already in use.

The tape library was added to the NetVault Server and the drive starts checking and could hear the tape movement on the tape library.
However the status of the drive in the NetVault Device Manager window does not change from a 'Checking' status and therefore couldn't use the drive at all.

Checked that the tape library was setup to Random mode as per the following KBA (sequential mode is not supported) and was configured correctly:

https://support.quest.com/netvault-backup/kb/81148

Rebooting the NetVault Server, the tape library and re-added the tape library in NetVault Device Management made no difference.

The folloiwng error were logged manu times with NetVault Backup:

Error   2014/07/24 03:26:34   0   Media   arcrestoreprimary   Command failed, re-initializing driver

With sub text:
CHGSCSI    22       0  22550 CMD PREVENT/ALLOW MEDIA REMOVAL [ 1e 00 00 00 01 00  ]
CAM         4       0  22606 Sense Key: '0', Ext Sense: '0', Qual: '0'
CHGSCSI    24       0  22606 CMD STATUS 'CHECK CONDITION' [2]
CHGSCSI    25       0  22606 CMD SENSE KEY 'NO SENSE' [0] - ASC 00 ASCQ 00
CHGMGR     11       0  22634 Process DEVICE_INTERFACE messge
CHGMGR      4       0  22634 Send Manager Msg (BEGIN)
CHGMGR      5       0  22634 Manager Msg 2555 status=0 request=395 text=''
CAM       174       0  22634 SG driver version 30534
CAM       155       0  22634 Initial reserve 32768
CHGSCSI    22       0  22624 CMD TEST UNIT READY [ 00 00 00 00 00 00  ]
CAM       221       0  22624 Unexpected status
CAM       224       0  22634 Using version 3 SG CAM
SCSI       14       0  22634 CMD INQUIRY [ 12 00 00 00 32 00  ]
CAM       221       0  22634 Unexpected status
SCSI       15       0  22634 CMD failed: errno 0

This is a generic message and can point to anything from the Motherboard, HBA, HBA Driver, SCSI cables, SCSI Terminators, tape library, drive(s), tape library firmware, drive(s) firmware (all drives should be on the same firmware version).
You may have to try a HBA SAS card and place in the HBA slot, to check if the SAS connector on the Motherboard is at fault.