My 12" PB arrived today and I was all set up to transfer files from my iMac (graphite, running 10.1) in Target Disk mode as informed to do by your good selves in this forum however it will not work, the firewire logo does not appear and the iMac boot as normal. Am I doing it right, plugging the 2 together then restarting the iMac whilst holding T, or am I missing something? Also, will this work with the iMac running 10.1? Thanks in advance for your help.