Phone Screen Gone Black

My phone hasn’t had a problem, I’ve had it for probably six months, until yesterday. The background went white and wouldn’t change when I changes it back to a different color, and then the screen went black. It still lights up slightly and vibrates when I push a button on the side, but it’s completely black. What could this mean?

There is a good troubleshooter along with links for getting warranty service here:,6720,9390/

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