What if the iPod won't turn on

Since not much info from your post, I assume you haven't do the 5Rs

1. After charging till full charge, at least 2 hours (preferably 4 hours)
2. Toggle the Hold switch, make sure you dont see the red mark when you do the next step
3. Reset the iPod -> Press Menu and Center button simultaneously for about 10 secs or till the Apple Logo comes ON
4. Then release the buttons
5. Select your preferred language.

Here is the Apple support Article on the 5Rs

http://www.apple.com/support/ipod/five_rs/classic/