oops sorry, wasnt sure where to post so went with the two best options I've removed the board and taken a look and replaced, however this has happened to both drives I've done this with. The method I used was to lift from the head contacts as described in the thread rather than try the short. this appeared to work and the disk did do the spin down on command, but pressing U made it just buzz on its return. The fact this happened consistantly twice makes me believe the lift up trick is flawed in some way?