I have an iPod Nano 7g and it doesn't turn on. Just a black screen. I have tried the home/sleep button + home button but that doesn't work. I have tried to turn it on. Nothing. I have left it charging for many many hours. Nothing. I have tried the recovery mode and iTunes method. Nothing. I have tried other cables and charger.
The iPod has not been dropped and no signs of physical damage. I guess the battery is dead and needs to be replaced.