Cannot boot up MacBook Pro

MacBook Pro plays start up tune, lights keyboard, but screen remains completely black. I don't use this computer often and wonder if lack of use contributed to the problem

I have a Macbook Pro 15'' Retina Display Mid 2012, and I'm having the same problem, but I use my computer very often.  I use it to edit videos in Final Cut Pro X and sometimes when I'm editting videos my computer turn off unexpected.
When I turn On my computer again, Everithing seems to be working but the screen, just like yours.  I had to turn Off and On a couple of time to make it work. =(
I don't know how to resolve this, I was looking for a similar article to debug it.

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