Black Screen Laptop

[Chells]

My Samsung ATIV Book9 Lite screen suddenly went black and the keyboard is also not working when the screen turns black I have to click the power button to turn it off and turn it on again. One thing more beside the light power indicator there's 2 lock picture on the left part of the laptop and whenever the screen turns black the other one lock image turns green, I look up the Samsung manual but it's not there. I wanted to know what the 2 locks means cause maybe it something to do with it why my laptop screen turns black. Please help me your help will be much appreciated. Thank you,

 

[digitaldoc]

Not familiar with the lock indicators you are seeing. Any chance you could link to an image of it?