I have a 2nd gen ipod touch on a tethered jailbreak. well i decided to upgrade to the untethered jailbreak, but right before i did my little brother shut off my ipod (I know you need a computer to turn it back on when it displays the white screen) well instead i decided to just restore my ipod so i decided to put it into DFU mode instead of reboot the ipod. When i put it into DFU mode the ipod shut off and now it will not show any signs of turning on. When i plug it in to my computer, it will display a pop about windows detecting something but not being able to recognize it. and when i go into itunes it doesnt recognize it either. What do i do to fix this problem?