Solution to shutdown problem I have found the answer to the problem. My default install of Windows 7 (Professional) has the Firewire control set so that the computer cannot turn the device off to save power. When Windows shuts down, it cannot turn off the firewire (IEEE 1394) controller and hence hangs. Simply solution for me anyway --- Control Panel -> Device Manager -> Select IEEE 1394 Host Bus Controllers and select 1394 Device. Right Click device -> Select properties -> Power Management Tab Check the box -> Allow the computer to turn off this device to save power ( Mine was not checked by default) Windows 7 now powers down fine.