How to recover an iPod Classic that won't turn on and doesn't appear as a drive?
Here's something that worked for me:


Put the iPod into a ziploc bag and seal it tightly.
Put it in the freezer overnight.
Take it out in the morning.


I thought that it was just an urban myth, but as the iPod was apparently dead, why not try it? I was (pleasantly!) shocked to see it start up again the next morning.