sonnyyu:
You CANNOT just assume since your USB device is plugged into a power source that you do not need the power lead on your USB cable! That is just plain wrong.
Yes, you're right - I wasn't planning on doing that and am aware the ground would be required. I would rather not rely on a custom USB cable though.
LarryD:
never from USB
Remove the USB polyfuse.
That's just what I was hoping for, could you describe where that is on the board so I know what to remove?
Thanks for your help.