So I plugged in my ipod touch today after it being completely out of batteries for about a week or 2. and the apple sign stayed on for a really long time on the ipod and the screen went black. so i pressed the home/menu button (i dont really know what to call it) and a battery sign came up with a little sliver of red on the edge and a lightening bolt under it. and it keeps going back to the apple sign, then black, the the battery and i dont think its charging becuase its been doing this for a while and the battery isnt getting fuller and it wont let me go to the menu or anything?! what do i do?