Wont start up or go into disc mode

Wont start up or go into disc mode
my i-pod 4th generation wont turn on, a while ago i had attempted to put it in disc mode would'nt even do that so now its been a few months and now its stopped working all together i've tried charging it, it just shows a battery charging symbol and it wont turn on if you leave it charging it just shows a battery charging symbol. whats wrong with

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