It's possible that the side power supply clip broke off or came loose on the inside. This is pretty common with this unit when it is dropped. If the top screen does not come on at all and the bottom one flickers or comes on for a second then it's probably the top LCD that needs to be replaced. There is a great instructable on this site for replacing the top LCD.
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try plugging it into the mains. If not, take it back and get it repaired. i cant do much more.