I tried searching but came up empty so I'm hoping someone out there can help. I'm trying to get data off of an old Firewire 400 hard drive and put it on my new MBP. I bought a cable from monoprice which has FW 400 on one end and FW 800 on the other. However, when I try to plug the firewire 800 end in my MBP with the FW 400 end already plugged in to the external my computer immediately shuts off, no warning nothing, pretty scary. This happens even when the external is turned off which I think is especially weird. The only way I have had this work is if I turn the external on, connect everything with my computer off, then when I reboot my laptop the drive loads fine. Anyone have any ideas? I would like to keep using my old external as a back-up but it will be a pain if I have to keep shutting down and re-starting. I'm also worried that something is wrong with my firewire. Thanks in advance for your help.