Was the tape drive working fine on the old server?
Did problems start with the drive when attached to the new server?
Is this a SCSI or SAS tape drive?
Assuming the drive is SCSI...try the following suggestions:
Check if a SCSI terminator was attached to one of the connectors on the back of the drive. The HP stand alone tape drives are self terminating. I have seen this cause some strange problems. If one was inadvertently installed, then power off the drive, remove it, and turn the drive back on. When the drive is turned on, you should see the self-terminating LED illuminate. Again, this assuming the drive is SCSI and a terminator was inadvertently attached to the drive when it was moved over from the other server.
Ensure the drive is not connected to a non-supported RAID controller. Here's the list of supported RAID controllers BE supports: http://www.symantec.com/docs/TECH70907
***Anything not on this list is not supported.
If the tape drive is attached to a non-RAID controller and it is the only device attached...then try resetting the card's BIOS to the default settings. This usually requires a reboot of the server and a keyboard sequence (i.e. Ctrl-A) during the server's POST (power-on-self-test).