My iPad has a black screen. When I press the home button nothing happens but if I hold it down Siri comes on.
My iPad mini will not come when the home button is pressed. If I hold it down Siri comes on
Try a forced restart. No data is affected by this. To force restart your device, press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo.
If your iPhone, iPad, or iPod touch won't turn on - Apple Support