ipod nano 5th gen not working

My friend gave his brand new ipod nano 5th gen. It was not at all working when it was not connected. Tried Everything from the manual but it was not working.
So I connected it to my Laptop and it now it powers on, the battery is full, everything works fine(music,camera,videos etc).
But as soon as I eject it from itunes and remove the cable, it turns off and then nothing.
any ideas ?

now its not even turning on..its kind of boot loop
 
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