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So when you've turned it off, holding the home button and connecting to iTunes doesn't work?

You may need to take it to the Genius bar and get it changed if under warranty otherwise bye bye iPod
 
You can try another computer to see if that works but I doubt it will.

maybe try doing a soft reset and before the Apple logo comes up plug it into your computer quickly while holding the home button to try and kickstart it.

Other than that, not much I can think of to try other than GBar
 
What is a soft reset? Also, will Apple replace the iPod if my friend says "my friend was upgrading it for me"?

The way to deal with the Genius bar is to play dumb (they already start out assuming people are dumb) and just say "It stopped working, can you fix it?" The worst case scenario is that they either can't or will refuse to fix it. Don't volunteer any detailed information unless they ask for it and you don't think they will believe "I don't know". If they say "Hey, this was jailbroken" it probably means they got it working. You can say "My friend said he was trying to fix it, I guess he did that..." Remember, jailbreaking has been officially ruled legal; they can't do anything about it except refuse to work on it further.
 
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