This might sound really stupid, but sometimes sticking your hard drive in the fridge overnight in an anti-static bag (the hard drive, not your fridge) can sometimes give them a bit more working life. It can be the case that the head stops moving and gets stuck, by freezing the hard drive you might be able to contract the metal enough to make it move again. Yeh, it sounds dumb but I've had it work for me a few times.
Best of luck!
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