What kind do you have? I have an old 20GB iPod and last May got worried that I'd have to get a new one because mine was acting up. I dropped it one day and after that I'd get a sad iPod face every time I tried to start it back up. Finally I got it to reset by hitting it against something and doing it the proper way on the iPod. Now anytime I drop my iPod I have to go through the same process of resetting it (though all my music is still on it) and sometimes have to do it more than once. But as long as I don't drop it and have to reset it it is working just fine and dandy. It's weird and annoying but maybe yours is doing something similar?
If it's doing what I think it's doing, then I've been having the same problem for about four to five months. Just send it off to the Apple Store - they'll wipe the memory but they'll give it a new battery. If you have all of your music on your computer, there's no problem. I have yet to do so, but I need to get all of my music on one hard drive first. >__>
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