I was going to remove the post, but thought this might help someone else. From Zeki support i found this.

Make sure your tablet has a full charge
Press and hold the Volume - button and tap the Reset button
(The reset button is located between the HDMI and USB ports)
Continue holding the Volume - button until the boot screen appears
Release the Volume - button

The reset button is not a button. I used an opened paper clip and repeated pressed on it while holding the volume and opening screen is back and tablet works. Happy