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lstoj
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Brightness Key Not Working

Hello, I have recently purchased a Dell Inspiron 15 i5558-5718SLV and I have noticed occasionally when I press the brightness key, the screen will turn black and it will lock the computer. It is a little frustrating. Is there a reason why it does this? I have tried to notice a pattern, but I am a little flustered as I cannot detect one. Thank you. 

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