Okay, there has to be a simpler way to do this. Migration assistant or transfer assistant isn't finding either machine despite connecting via ethernet and having sharing enabled. If I punch in the IP address it keeps asking for the root password of one of the machines despite the fact that that once entered there's nothing for it to copy. Baffling. At this point the only thing I can think of is to use time machine on the original Mac, back up the original boot drive and physically transfer it to a 5 TB drive I have connected and use time machine to back it up. Then I'll physically need to connect it to the new machine to restore it. The drive has USB3 so I'll use the USB 3 ports on it but honestly, I've had this new machine for hours and haven't transferred a single byte of data. I understand moving to new faster technologies but going from a FW800/USB2 iMac to a Thunderbolt 2 / USB3 mac has been a cringing nightmare. Superduper used to be my rescuer in such situations - no more. With the other machine mapped it can't see the drive to connect to. Anyone else got any other bright ideas before I was 4 more hours copying my original boot drive? Oh for the days of Target disc mode and firewire.