To restart, press and hold the on button on the upper right of the device. Select 'Restart' from pop-up menu.
Not sure if you can recalibrate your screen.
If all else fails, perhaps you can try hard reset:
http://hard-resets.com/hard-reset-asus-memo-pad-hd7/
Try if you can avoid wiping data by selecting option not to wipe.
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