HP9000/345 SCSI Problem

Hi, I have an HP9000/345 system with two HP-IB interfaces. However I see that inside there are two SCSI connectors (one with termination resistors next to a power socket for a disk drive. I also found a reference that HP shipped 345 systems with an internal SCSI disk drive. However, my system does not locate a SCSI controller when it boots (note I am talking about the boot monitor, I have not managed to boot an OS on this machine). If I remove the ribbon cable connecting the second HP-IB controller, the machine recognizes a SCSI controller , but if I connect anything to one of the SCSI connectors, the system complains that the SCSI controller registers are bad (failed test). I believe that there is some config problem (perhaps some jumpers need to be changed?). Anybody has any suggestions? Thanks **vp