I have a generation 4 IPod, and I've replaced the hard drive and battery. Just recently I've put rockbox on it, and it seemed to work fine. Well today it seems the battery will not charge. I've placed it on the wall charger and all it does is cycle through the Apple symbol, and then shuts off, occasionally it will get to the Rockbox logo then shut off. As for plugging it into a PC all I get is the battery with the lightning bolt symbol. I cannot figure out what may cause this to happen but it is not making me happy.