First delete all the devices in Backup Exec - you must disable them first, and then delete - start with the tape device, then the loader, once clear - shutdown the server.
Change the SCSI ID's on the Overland - 2 for the Loader arm, 3 for the tape drive - recycle the loader, when initialised, make sure it is seen properly in the SCSI bios post.
Once backup and running, make sure Windows can see the tape device and make sure under Medium Changers, there is an unknown medium changer.
Start backup Exec.
Run the device configuration wizard - make sure it sees it as an autoloader and not standalone drives.
Once done and it looks ok - do an inventory on 1 slot - if it comes back successful, inventory the rest of the slots.
You may also need to disabled bar code rules on the loader - right click in device, configuration, uncheck bar code rules.
See how u go with this
Lyon