Laptop screen won't turn on?

I press the power button and I unlock my laptop but then the screen stays black. I can see my cursor and I can use key to open things like the task manager. I have a Lenovo Y510P. Please help! It happened after I downloaded a emulator file. As soon as I press the power button again the screen flicks to a "shutting down" screen and turns off.

Dude I had this same problem yesterday, just open up your laptop, turn it on, press control, alt, delete, then end the process named "runonce", it should work fine.