I have had this problem on my ipod before, all you need to do is hold down the home button and the on/off button for 8 seconds, then the screen will flicker several times and the ipod will restart. When it turns back on, make sure you reconect to your wifi network to your ipod and everything will be fine. This plan works on: Ipod classic Ipod nano,2g,3g,4 Ipod touch-2g,3g,4,5