I'm at a loss for a solution to my FW800 external drives operation. I have 2 working FW800 drives. Had a 3rd(seagate) that quit working FW and only worked USB2.0 It was under warranty, so Seagate sent me 2 other flexes to replace the original. Same problem. Ok. I ordered 2 miniStacks from OWC for its FW800 ports. Same problem. Have tried different cables, no go. When I plug the drives in (individually or chained to the working drives) FW800 only, the Mac just freezes and nothing. Have to reboot. Every thing shows a go (power on spin up) but nothing. I can't figure it out. Thanks for finishing this tome. Suggestions?