If it does lock up before you save the data on it (I'd be ordering a new drive right now btw), first disable the spinning down of the drives in HiJack. Then, as you are applying power, give a smart WHACK to the side of the drive. That should get it going.

My failed drive was most likely a frozen bearing. Once it was spinning, it was fine (until it got too hot or spun down). I found I needed to get it spinning during bootup to have any access to it. I did the data extraction on a PC for the higher bus speeds.

Good luck!