Al iMac 24, Lacie D2 quadro initially worked (out of the box) on FW800 ... moved it over to my PC, hooked it up with FW400, reformatted so I could xfer my PC files. got that done, reconnected to iMac, had to use FW400. system does not see the drive when hooked up with FW800. moved all the files to the internal iMac drive, then reformatted for the Mac. Still will not connect with FW800 (400 works fine). Have reset PRAM, booted with O/S disk (which can't see the drive on FW800 either). any ideas out there ?