Black screen for Alienware 17x

Hi I bought a new laptop in the past month or so. It was bought in US but now I am in Hong Kong. Today my alienware laptop just stopped displaying anything on the LCD screen. It just shows a black screen but everything is still working fine. I proved ths by connecting the laptop on an external monitor through HDMI.

What can I do to get the black screen situation fixed? I am at a loss right now. I have to borrow my friends laptop to use :(