the unit were working?? or it's a new installation, cause it could be wrong configurated, should know which scsi adapter, its LUN number, BUS and ID to correct configure it, ny device attacjed to a scsi card must be configured with the correct driver for example if it's an ultra 320 scsi card you must use ad320 driver, please give more information, additionally should the unit display it's information on post ? at start up of equipment