Q: macbook pro chimes but black screen

I have a MacBook Pro with 15 in Retina Display. When I go to turn on my Mac, it chimes, like usually, but the screen apparently stays black (lighting up a little). The apple logo in the back is lit as well, as if the computer is on. I have tried PRAM, attempting to get it out of sleep mode, and PMU, but none of these have worked thus far. How do I get the screen to stop being black and work like usual? My Mac was working normally about half an hour before, and then I took a break and shut it off. The battery was at 95% when turned on; I have also tried charging the computer. I updated the computer over three months ago, and I didn't do anything unusI'm legally blind and in college, so I depend upon my Mac to do all my schoolwork! Any help would be greatly appreciated! Thank you!