I've only had it for a day. I was using MP3 downloader app and it had an error so I had to force close, but it never fully closed. There's no listings of songs it's just blank white. I tried turning it off but it won't. So do I take out the battery? And if so how do I take out the back of the phone??? I've been trying to pry it open for a while... I know I'm stupid for that.