I have an old iPhone 3G, that was laying in the closet for a while. I tried turning it on (to give it to someone). After I plugged in, it showed me the "low battery/charging" picture for a few minutes, then turned into Apple's "booting" logo. But it won't go past that! It keeps showing that apple logo for days! If I unplug that it still shows Apple logo, until the battery dies, then if I plug, the picture repeats itself. Is there a way to fix this?