No one was more surprised then me this afternoon when a previously 
unresponsive hard drive was left in the freezer over night, and lasted 
long enough to get 800mb of data (we got ALL of the documents we 
needed).  This particular failure sounded like the platters were a 
little loose.

So, if you've tried everything else, this is worth a try.

As an aside, this is the 4th Toshiba HD I've had to replace out of 
various Macs and PCs over the past 4 years.