My Macbook Pro 13" retina Display 2014 doesn't turn on. First, I open it and it doesn't wake up like it normally would, then I hold the power button and it makes the "doo" sound but the screen is black (but on) and the keyboard lights up, no display. The keyboard brightness doesn't work and no functions work. Then when I close it, the logo is still lit as if it didn't recognize that that closed it. I didn't drop it recently and nothing spilled on it. I went to the Apple store and they didn't know what was wrong with it. I tried to connect another display but nothing happened, it just said HDMI no signal. I'm thinking to replace the hard drive. Do you think its the Graphics Card or some other hardware, or maybe a software problem? Please respond this laptop is very important to me!! Thank you.