help me something with my samsung google nexus s

[Andy Flores]

I dropped my Samsung Google Nexus S alot in school now my phone doesn't turn on or charge and when I got it used when I turn it off And when I want to turn it on again I need to take out the battery and put it back in and I had trouble when I ran out of battery it was hard to get it to charge but I always made it to work so I need someone to tell me what's wrong or what part do I need to make it work

 

[Andy Flores]

Come on someone answer plz