Hello. I had my wife's iphone 4 on a charger for what must have been two day straight. I tried to turn it on and got nothing..so i assumed that maybe i didnt have it on the charger at al... so i charged it again overnight...next morning, nothing. i thought maybe i burned the battery out from overcharging, so i figure i would replace the battery. Still nothing...and the battery that was in her phone still works because i put it my phone and it powered up nicely. so now i am all out of ideas. any thoughts? Thanks.