MacBook Pro screen won't turn on

[Big Stevie]

My 2012 MacBook Pro Mavericks has suddenly stopped turning on properly. I get the start up chime and the keyboard lights up, but the screen doesn't turn on, it remains black.

I always just close the lid to turn it off, but occasionally i do a full turn off with the power button. When I used the MacBook earlier today I turned it off by holding the power button down. 30 mins later I turned it back on and started experiencing the problem.

I've made a Genius appointment for next Friday, hopefully my 3 yr Apple Care will save me, but is there anything I can try myself in the meantime please?

 

[MacForScience]

Is the screen actually off, or is the image there but it just looks like the light was turned out?

Cheers

 

[Big Stevie]

The screen is definately off. Are there any techniques where I could switch the MacBook on whilst holding down certain buttons, to reset it?