Try to remove the battery and re insert it back in to see if it will work. Or hold down the power on/off for about 15 seconds, that should do the job.
If that does not do it, then calibrate the screen, to calibrate the screen, screen calibration do not just work once you do it, you have to do it over time for it to work. Ensure you are calibrating properly. These are the proper steps to follow when trying to calibrate the screen:
Try this repeatedly till you get it to work. If it does not work, then it means there is an internal problem that need to be checked by a repairman.That should do the job for you.
hope this helps.
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