i just updated the latest ios onto my mini ipad 4 it now has a black screen and i cant restart any advice?

If iPad isn’t responding, do one of the following:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPad won’t turn on or is frozen. Or if your iPad isn’t working correctly after you restart it, see the iPad Support website.