Computer booting up but no start screen, only black screen.

Hello everyone.

I have a Asus R510L Notebook, running Windows 8.

Theproblem is, whenever I boot up, it's simply black however the lights is on and I tried removing the battery which didn't help. There is little to no noise whenever it is running and no Asus/Windows start screen.

It's really important for me to fix since I have school documents there and I need it for homework asap, so any answers that may help is really appreciate it.

In advance thanks for the help and have a good day!

More information;

It happened last night when connecting a HDMI cable to the pc in order to watch a dvd on the laptop. When reconnecting the HDMI, the screen went black.

I tried using the F8 and F5/F7 hotkeys to see if that was the problem but no avail. I also tried using the TV as as a external monitor but it wouldn't go through.