There is an iMac throwing up the ? inside a Folder when booted, or sometimes the pinwheel of doom. I would like to: Start iMac in Target Disk Mode Plug in iMac to my MBP with firewire 800. Use Migration Assistant to pull data from iMac to an external drive plugged into my MBP. So I can wipe/reinstall OSX and then plug in the external drive to the iMac and use Migration Assistant to pull data back onto iMac. Is this possible? To point to a destination or Folder for Migration Assistant?