iPad mini screen is black.
I was using an app and I was quickly closing the app (not with the home button) and locked my ipad before the app actually closed. I returned and my screen is black but you can see a trim of my background. I tried usin Siri to open apps but she claims she cannot. I can't shut it down by holding down power button and the battery stays 100%. I'm not sure what to do at this point since this is my second iPad mini (Other one wouldn't charge or turn on) so I've already used the warranty for it. Any advice on what I should do if any? Thanks for any responses. (Currently using IPod touch to report this problem)
Ipad mini-OTHER, iOS 6.1.2