That could have been a loose connection or blown fuse in the tip of the charger, so you may want to check that and see what you find.
Also, to complete the calibration routine SUCCESSFULLY, do the following.
1) Make sure the device is FULLY charged - or at least charged up for AT LEAST an hour or so.
2) When the dot appear, try to CAREFULLY and PRECISELY touch the VERY CENTER of each dot.
NOTE: Speed is not important for this routine, but touching the exact center of each dot is.
So if you can, try to use a plastic tipped "stylus", or the erasure end of a pencil, to touch the exact center of each dot.
Also, the dots WILL MOVE around the screen, but if done correctly, after about 5-7 touches, the routine will "complete", and the device will (hopefully) go back to "normal" operation.
Please give that process a try and let me know your results.
Thanks, ***** *****