i recently put rockbox onto my ipod. now when i try turning the ipod on, the apple logo flashes for a split second, then a black bar about 1 inch tall appears on the bottom of the screen, then it just shuts down. ive tryed turning the hold switch on and off, then holding menu+center button for 15 seconds, but nothing works. since the apple logo comes up, i think theres some battery life left. any ideas on how to solve this?