How do I restore unresponsive ipad?

The problem is that I can't turn it off. I don't think the power button is okay, it only locks and unlocks the screen but does not shut the device off. My ipad however, I think, is also broken, i can't use it, nothing is responsive, the screen is empty, only the wallpaper is on there. The assistive touch is pretty much the only thing that is responding, with the volumes plus the notification center. But that's it. Even the lock screen button from the assistive touch doesn't respond when I hold it to shut the device off. What am I gonna do?