@Butters
Sorry for the late reply, I have disassembled the unit and checked for dry joints around the USB connector - it is solid. I have looked at the Disk manager screen for any activity during the USB connect chime and there are no additional drives appearing, upon releasing the corner of the screen, windows alerts the USB connection is dropped and the unit boots as normal - there is still no activity shown in disk manager, The unit is however recognised in device manager but shows as disconnected (I have made all hidden devices visible). I have performed a master reset including clearing non volatile memory with the same results after reconfiguring the unit. I have tried running updater but I get a message from updater that states there are no updates for this device and updater terminates.
Thanks for your help