Sheesh, Ed, we
are the professionals ... at least,
the ones you can get for free.
If I had to choose between swapping hdd disk platters between drives, and just shooting the drive off a post with a high-power rifle, I'd select the rifle since it will get me the same result and be a lot more fun as well.
Here's what I would do with a hdd that clicks and refuses to let me in:
1. KICK-START. Maybe the platters need to be spun a bit manually to get them past some tiny obstruction. The hdd is toast anyway, so I'd open it up to expose the platters. Some other user on this board did this inside a clean plaster bag; good idea! Once the platters and hub were exposed, I'd spin the hub by hand ...
once while it was powered off, and then (adjustingly)
once again while it was trying to spin up with power applied. If that worked, backup all data to tape or something, and then take the drive to the rifle range.
2. LOGIC BOARD. If the kick-start didn't work, then I'd seek to replace the logic board on the drive. The clicking may be caused by a bad board, so perhaps this would work. I'd go a surfin' eBay to find the make and model of drive, and then take my chances that the firmware is the correct version on it. This is a skilled replacement; it may require splicing ribbon conductors, etc. There's a website of some guy on the net about doing this exact kind of replacement; you might find the link on our beloved Slashdot (