When I unplug my earphones my iPod Touch goes to a black screen with apple logo?

I've already turned off/on through "Slide Power Off" and I've already Hard Restored through home & off button.

I restored, but used the backup of my iPod and it still went to a black screen.

I have restored again through a "new ipod" and if it still goes to a black screen what should I do?
Also, can I use my apple id from my first iPod account (that they asked to use the backup) ?
 
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