I am new at arduino and ı don't know what happened

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i ve been working arduino uno ad no matter ı try ı can't download sketch board.i used download sketches no problem few hours ago.it fell table 10 cm above table.
the leds on board emmitting light.please help:(
 ps.sory mistakes.

go "tools" @ top left of ide program (the program use make sketches) , select board type , port arduino connected to. if arduino configured, port automatically have name of arduino next it


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