Hey hi , there
well for this type of problem .. i think you should try these methods :
1 - if you can see the < removable device > icon in My computer .. but your itunes doesnt detect you ipod
it means , maybe you should install your I tunes again .
2 - If your ipod is hanged < the reason of hanged ipod can possibly be due to being carelessly thrown from 2 story building <happened with me > but in that case you should leave the ipod .Until itz battery is gone and den try 1 method ..
one . First connect it with computer < not by your ipod usb charger >.
3 - if your ipod is working fine and you cant see anything on your computer < no detection > then its 99.9 percent problem with your USB data cable < the white wire >
the other 0.1 percent can possibly be the Jack of your ipod , there is somthing wrong with it . if so , you can can contact with your nearest Apple store .
Peace ,....V
Note : these all things have been experienced by me
i have used over 27 ipods .