my ipad mini will not turn on

Try these methods.

Reset: hold down the Home and Power buttons until you see the Apple logo (10-15 seconds).

If this doesn't help, you might need to Restore your iPhone: https://support.apple.com/en-us/HT204184

If your backup is to iTunes, make sure it's an encrypted backup.

Otherwise, give us more details about what you're doing and what is happening.

Hi

Follow the instructions here, including contacting Apple Support or making a Genius Bar reservation if necessary:

If your iPhone, iPad, or iPod touch won't turn on - Apple Support