Half my screen is frozen

Half of my nook hd screen is frozen, not the entire screen, just half. I can use about half the keyboard, but only being able to type on half is difficult. What can I do to fix this issue?

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What happened? Did you drop it? Accidentally hit it against something? It gradually started doing this?

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Nothing as far as I can remember. I hadn't used it in a couple months but it stayed in the same drawer that entire time.

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And it wasn't gradual. I opened it up and half the screen was unresponsive. I tried to do a reset but since half the screen doesn't work I can't even type in a wifi password.

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