The 'slide to unlock' not responding

Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.

Thank you. it is very helpful. solved my problem

Thank you! When holding homme and lock button, my iPhone restart and I can use it again!

i am getting voice cammand only, i cannot open the phone by sliding

Try triple-click the Home button (must be fast)