Why won't my ipod sync anymore?

My ipod nano wont synch any songs or videos.When I drag the music from itunes to my ipod it wont sync the song.It worked perfectly before but now it doesnt.Normally what I would do is click the song and drag it to my ipod sign and it would like swallow the song and on top it would say synchcronizing but now it doesnt do anything!!please HELP ME

Okay - so you can see the iPod still in your iTunes when you connect it, but its not synching? Have you tried reinstalling iTunes - the problem might be with it rather than your iPod. Also, what generation of iPod Nano do you have?

get your ipod or computer fixed

If reinstalling iTunes doesn't work, reset your iPod. Hold down the center button and press and hold up on the top click wheel button (which is the menu button) until your iPod resets. If that does nothing for you, restore your iPod through iTunes to its original factory settings. This deletes all of your songs on your iPod but it may be messing up because you have a corrupted file, and clearing it out may do the trick.

If none of that works and your Nano is a relatively new model, take it to the place where you bought it and see if they have an Apple technical support person to take a look at it.

omg! I'm having the same problem~
and I took it to apple
and they gave it back, but it still doesn't work =[[