Hello, I recently obtained an Iphone my cousin had dropped in the sink. He bought a new one and gave me this one because he didn't think it would work anymore. I plugged it in and it turns on and is functional, however, sometimes it will go to a blank white screen and the power turns off even when it's plugged in after a certain amount of time. Also, he jailbroke it so I can't take it to a place to get it fixed because it voids the warranty. Is there anything I can do to make the battery actually charge and make the screen not turn white? Thanks for any replies.