Since the main SCSI controller is basically the A2091 circuitry on the Amiga 3000s motherboard my advice would be to remove the 4.3 GB hard disk and install a smaller hard disk. Only use the 50-pin SCSI hard drives with an Amiga 3000 computer. Do NOT use SCSI-Wide hard disks. If you follow my advice your Amiga will work again. It is best to treat your Amiga 3000 computer as if it were an Amiga 2500 with Zorro III slots. So think small, better made hard drives. I personally use 1 GB and 2 GB hard disks in my own Amiga computers. They are better made and are very reliable. :-D